"numbers" entries

Four short links: 31 May 2013

Four short links: 31 May 2013

  1. Modeling Users’ Activity on Twitter Networks: Validation of Dunbar’s Number (PLoSone) — In this paper we analyze a dataset of Twitter conversations collected across six months involving 1.7 million individuals and test the theoretical cognitive limit on the number of stable social relationships known as Dunbar’s number. We find that the data are in agreement with Dunbar’s result; users can entertain a maximum of 100–200 stable relationships. Thus, the ‘economy of attention’ is limited in the online world by cognitive and biological constraints as predicted by Dunbar’s theory. We propose a simple model for users’ behavior that includes finite priority queuing and time resources that reproduces the observed social behavior.
  2. Mary Meeker’s Internet Trends (Slideshare) — check out slide 24, ~2x month-on-month growth for MyFitnessPal’s number of API calls, which Meeker users as a proxy for “fitness data on mobile + wearable devices”.
  3. What I Learned as an Oompa Loompa (Elaine Wherry) — working in a chocolate factory, learning the differences and overlaps between a web startup and an more traditional physical goods business. It’s so much easier to build a sustainable organization around a simple revenue model. There are no tensions between ad partners, distribution sites, engineering, and sales teams. There are fewer points of failure. Instead, everyone is aligned towards a simple goal: make something people want.
  4. Augmented Reality Futures (Quartz) — wrap-up of tech in the works and coming. Instruction is the bit that interests me, scaffolding our lives: While it isn’t on the market yet, Inglobe Technologies just previewed an augmented reality app that tracks and virtually labels the components of a car engine in real time. That would make popping the hood of your car on the side of the road much less scary. The app claims to simplify tasks like checking oil and topping up coolant fluid, even for novice mechanics.
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Four short links: 30 April 2013

Four short links: 30 April 2013

China Threat, China Opportunity, Open Source Sustainability, and SQL for Cohort Analysis

  1. China = 41% of World’s Internet Attack Traffic (Bloomberg) — numbers are from Akamai’s research. Verizon Communications said in a separate report that China accounted for 96 percent of all global espionage cases it investigated. One interpretation is that China is a rogue Internet state, but another is that we need to harden up our systems. (via ZD Net)
  2. Open Source Cannot Live on Donations Alone — excellent summary of some of the sustainability questions facing open source projects.
  3. China Startups: The Gold Rush (Steve Blank) — dense fact- and insight-filled piece. Not only is the Chinese ecosystem completely different but also the consumer demographics and user expectations are equally unique. 70% of Chinese Internet users are under 30. Instead of email, they’ve grown up with QQ instant messages. They’re used to using the web and increasingly the mobile web for everything, commerce, communication, games, etc. (They also probably haven’t seen a phone that isn’t mobile.) By the end of 2012, there were 85 million iOS and 160 million Android devices in China. And they were increasing at an aggregate 33 million IOS and Android activations per month.
  4. Calculating Rolling Cohort Retention with SQL — just what it says. (via Max Lynch)
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Four short links: 26 April 2013

Four short links: 26 April 2013

Engagement Cliff, SSL Best Practices, Public Domain Numbers, and GitHub License Sniffing

  1. The Engagement CliffGallup surveyed nearly 500,000 students in grades five through 12 from more than 1,700 public schools in 37 states in 2012 and found that by the time students get to high school only about 4 in 10 qualify as engaged.
  2. SSL/TLS Deployment Best Practicesclear and concise instructions to help overworked administrators and programmers spend the minimum time possible to obtain a secure site or web application. In pursue of clarity, we sacrifice completeness, foregoing certain advanced topics. The focus is on advice that is practical and easy to understand.
  3. Do Bad Things Happen When Works Enter The Public Domain? — research to answer that question. Spoiler: no. (via Surprisingly Free)
  4. Most GitHub Projects Not Open-Source Licensed (The Register) — 1,692,135 code repositories scanned, 219,326 (14.9%) percent had a file in their top-level directories that identified any kind of license at all. Of those, 28 per cent only announced their licenses in a README file, as opposed to recommended filenames such as LICENSE or COPYING. MIT license overwhelmingly popular compared to the different reciprocal (GPL-like) ones.
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Four short links: 24 April 2013

Four short links: 24 April 2013

Solar Numbers, Process Managers, BitTorrent Sync, and Motherfrickin' Snakes in Your Motherfrickin' Browser

  1. Solar Energy: This is What a Disruptive Technology Looks Like (Brian McConnell) — In 1977, solar cells cost upwards of $70 per Watt of capacity. In 2013, that cost has dropped to $0.74 per Watt, a 100:1 improvement (source: The Economist). On average, solar power improves 14% per year in terms of energy production per dollar invested.
  2. Process Managers — overview of the tools that keep your software running.
  3. Bittorrent Sync — Dropbox-like features, BitTorrent under the hood.
  4. Brython — Python interpreter written in Javascript, suitable for embedding in webpages. (via Nelson Minar)
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Four short links: 28 March 2013

Four short links: 28 March 2013

Chinese Lessons, White House Embraces Makers, DC Codes Freed, and Malware Numbers

  1. What American Startups Can Learn From the Cutthroat Chinese Software IndustryIt follows that the idea of “viral” or “organic” growth doesn’t exist in China. “User acquisition is all about media buys. Platform-to-platform in China is war, and it is fought viciously and bitterly. If you have a Gmail account and send an email to, for example, NetEase163.com, which is the local web dominant player, it will most likely go to spam or junk folders regardless of your settings. Just to get an email to go through to your inbox, the company sending the email needs to have a special partnership.” This entire article is a horror show.
  2. White House Hangout Maker Movement (Whitehouse) — During the Hangout, Tom Kalil will discuss the elements of an “all hands on deck” effort to promote Making, with participants including: Dale Dougherty, Founder and Publisher of MAKE; Tara Tiger Brown, Los Angeles Makerspace; Super Awesome Sylvia, Super Awesome Maker Show; Saul Griffith, Co-Founder, Otherlab; Venkatesh Prasad, Ford.
  3. Municipal Codes of DC Freed (BoingBoing) — more good work by Carl Malamud. He’s specifically providing data for apps.
  4. The Modern Malware Review (PDF) — 90% of fully undetected malware was delivered via web-browsing; It took antivirus vendors 4 times as long to detect malware from web-based applications as opposed to email (20 days for web, 5 days for email); FTP was observed to be exceptionally high-risk.
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Four short links: 31 January 2013

Four short links: 31 January 2013

Courier Prime, Lethal Education, Internet Numbers, Mobile Numbers

  1. Courier Prime — tweaked Courier “for screenplays” (!). (via BoingBoing)
  2. The Dead Grandmother/Exam Syndrome and the Potential Downfall Of American Society (PDF) — education is dangerous to female extended family members. As can be seen in Table 1, when no exam is imminent the family death rate per 100 students (FDR) is low and is not related to the student’s grade in the class. The effect of an upcoming exam is unambiguous. The mean FDR jumps from 0.054 with no exam, to 0.574 with a mid-term, and to 1.042 with a final, representing increases of 10 fold and 19 fold respectively. (via Hacker News)
  3. Internet: 2012 in Numbers — lots of surprising numbers, with sources. Three that caught my eye: 42.1% – Internet penetration in China; 2.7 billion – Number of likes on Facebook every day; 59% – Share of global mobile data traffic that was video.
  4. 2013: The Year Ahead in Mobile (Business Insider) — Mobile is already 1/7 of global Internet traffic and growing its share quickly […] on pace to top 25% by year end. Interesting prediction that rich people already have devices, so everyone’s working on low-cost units so they can sell to new customers in “growth markets” aka developing world.
Comment: 1
Four short links: 10 January 2013

Four short links: 10 January 2013

Engineering Virality, App Store Numbers, App Store Data, and FPGA OS

  1. How To Make That One Thing Go Viral (Slideshare) — excellent points about headline writing (takes 25 to find the one that works), shareability (your audience has to click and share, then it’s whether THEIR audience clicks on it), and A/B testing (they talk about what they learned doing it ruthlessly).
  2. A More Complete Picture of the iTunes Economy — $12B/yr gross revenue through it, costs about $3.5B/yr to operate, revenue has grown at a ~35% compounded rate over last four years, non-app media 2/3 sales but growing slower than app sales. Lots of graphs!
  3. Visualizing the iOS App Store — interactive exploration of app store sales data.
  4. BORPHan Operating System designed for FPGA-based reconfigurable computers. It is an extended version of the Linux kernel that handles FPGAs as if they were CPUs. BORPH introduces the concept of a ‘hardware process’, which is a hardware design that runs on an FPGA but behaves just like a normal user program. The BORPH kernel provides standard system services, such as file system access to hardware processes, allowing them to communicate with the rest of the system easily and systematically. The name is an acronym for “Berkeley Operating system for ReProgrammable Hardware”.
Comment: 1
Four short links: 3 January 2013

Four short links: 3 January 2013

Historic Social Media, Latency Numbers, Quantified Auto, and I Feel Old

  1. Community Memory (Wired) — In the early 1970s, Efrem Lipkin, Mark Szpakowski and Lee Felsenstein set up a series of these terminals around San Francisco and Berkeley, providing access to an electronic bulletin board housed by a XDS-940 mainframe computer. This started out as a social experiment to see if people would be willing to share via computer — a kind of “information flea market,” a “communication system which allows people to make contact with each other on the basis of mutually expressed interest,” according to a brochure from the time. What evolved was a proto-Facebook-Twitter-Yelp-Craigslist-esque database filled with searchable roommate-wanted and for-sale items ads, restaurant recommendations, and, well, status updates, complete with graphics and social commentary. But did it have retargeted ads, promoted tweets, and opt-in messages from partners? I THOUGHT NOT. (via BoingBoing)
  2. Latency Numbers Every Programmer Should Know (EECS Berkeley) — exactly that. I was always impressed by Artur Bergman’s familiarity with the speed of packets across switches, RAM cache misses, and HDD mean seek times. Now you can be that impressive person.
  3. Feds Requiring Black Boxes in All Vehicles (Wired) — [Q]uestions remain about the black boxes and data. Among them, how long should a black box retain event data, who owns the data, can a motorist turn off the black box and can the authorities get the data without a warrant. This is starting as regulatory compliance, but should be seized as an opportunity to have a quantified self.
  4. Average Age of StackExchange Users by Tag (Brian Bondy) — no tag is associated with people who have a mean age over 30. Did I miss the plague that wiped out all the programmers over the age of 30? Or does age bring with it supreme knowledge so that old people like me never have to use StackExchange? Yes, that must be it. *cough*
Comments: 3
Four short links: 31 December 2012

Four short links: 31 December 2012

Vanishing Landlines, Factory Help, Spectral Analyzer, and the State of the World

  1. Wireless Substitution (BoingBoing, CDC) — very nice graph showing the decline in landlines/growth in wireless.
  2. Maker’s RowOur mission is to make the manufacturing process simple to understand and easy to access. From large corporations to first time designers, we are providing unparalleled access to industry-specific factories and suppliers across the United States.
  3. mySight (GitHub) — myspectral.com Spectruino analyzer for light spectra in UV/VIS/NIR.
  4. State of the World (Bruce Sterling, John Lebkowsky) — always a delight. Come 2013, I think it’s time for people in and around the “music industry” to stop blaming themselves, and thinking their situation is somehow special. Whatever happens to musicians will eventually happen to everybody. Nobody was or is really much better at “digital transition” than musicians were and are. If you’re superb at digitalization, that’s no great solution either. You just have to auto-disrupt and re-invent yourself over and over and over again.
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Four short links: 26 December 2012

Four short links: 26 December 2012

Remote-Controlled Arduino, JS Notifications, Device Numbers, and Network Hostility

  1. Arduino IR Remote Control — control your Arduino project via your TV’s remote control. (via Arduino)
  2. holler — WTFPL-licensed Javascript library for real-time in-app notifications via the commandline (uses node). (via Javascript Weekly)
  3. First Tweets — numbers of “first tweet from my new {X}” giving indications of the popularity of each. Not good for Surface, alas.
  4. It’s Clear Verizon is Blocking Google Wallet Anti-Competitively — Verizon blocked Google’s mobile payments app until Verizon’s own was available. One irony of course is that in conjunction with Verizon, Google worked to gut meaningful network neutrality rules that would have prevented this very thing from happening on wireless networks.
Comment: 1