Four short links: 6 November 2014

Karma — kick-ass open source Javascript test environment.
The Dark Market for Personal Data (NYTimes) — can buy lists of victims of sexual assault, of impulse buyers, of people with sexually transmitted disease, etc. The cost of a false-positive when those lists are used for marketing is less than the cost of false-positive when banks use the lists to decide whether you’re a credit risk. The lists fall between the cracks in privacy legislation; essentially, the compilation and use of lists of people are unregulated territory.
7 Principles of Rich Web Applications — “rich web applications” sounds like 2007 wants its ideas back, but the content is modern and useful. Predict behaviour for negative latency.
Collaborative Filtering at LinkedIn (PDF) — This paper presents LinkedIn’s horizontal collaborative filtering infrastructure, known as browsemaps. Great lessons learned, including context and presentation of browsemaps or any recommendation is paramount for a truly relevant user experience. That is, design and presentation represents the largest ROI, with data engineering being a second, and algorithms last. (via Greg Linden)

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Javascript Testing, Dark Data, Webapp Design, and Design Trumps Data