Facebook blocks sensitive medical data shared by third-party apps User information from apps is regularly shared with Facebook through a tool that offers developers free analysis of data to help guide improvements to apps, according to the investigation. Share Via Email | A+A A- By AFP SAN FRANCISCO: Facebook has started blocking sensitive health information that third-party apps had been sharing with the social network in violation of its own rules, said New York officials who investigated the situation. Data fed into a Facebook analytics tool by app makers included medical diagnoses and whether users were pregnant, according to a report shared by New York financial services department on Thursday.