You Give Apps Sensitive Personal Information. Then They Tell Facebook.
Millions of smartphone users confess their most intimate secrets to apps, including when they want to work on their belly fat or the price of the house they checked out last weekend. Unbeknown to most people, in many cases that data is being shared with someone else: Facebook. The social-media giant collects intensely personal information from many popular smartphone apps just seconds after users enter it, even if the user has no connection to Facebook.