Here's a really stark piece in PandoDaily (a story aggregator about start ups, I think -- see here) about the risks of sharing personal health and other data via activity trackers, dietary logs, loyalty cards, social media check-ins, etc.
You are your data: The scary future of the quantified self movement (via Pando Daily)
By Michael Carney On May 20, 2013Few if any consumers who fell behind on their credit card payments in the early 2000s thought that half a decade later employers would use their credit report to determine their job worthiness. Few avid social media…