Tells you which friends are better to hang with

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I read about this in @sarahbuhr's TC article yesterday. It's an app that measures your heart rate to better understand who you most enjoy spending time with. I'm all for creative, seemingly silly ideas but this is ridiculous. Would love to be convinced otherwise. What am I missing?
@sarahbuhr @rrhoover This could be a poor man's version of a polygraph. VCs could strap it on to people before they pitch and know what's real and what's not. Same goes for interviewers of a job ;)
@rrhoover @joshuaoxj The dystopian sci fi Silicon Valley future is nigh!
I have found @maxstoller's product Red/green better in this case.