"The only piece of information you see is the information you already know - that might be a Facebook name, a Twitter id or e-mail address, " says Jonathan Grubin, head of Send Social.

BBC: Real life postage that just needs your e-mail address

According to Grubin, participants can sign up, input several points of instrumentation, and within minutes see which parts of the app are being used by exact numbers of users and what exact combination of devices, operating systems, and other conditions led apps to crash.

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