What about OFFLINE data they collect on you?
The reports about Facebook buying offline data to fill out their user profiles was an eye-opener to me… as if they didn’t know enough already… creeped me right out.
Links: Just search ‘facebook buys offline data’ to remind you of the reports from last year.
Here’s a quote from an article at pymnts.com
Jeffrey Chester, executive director for the Center for Digital Democracy, was quoted as saying, “They’re not being honest. Facebook is bundling a dozen different data companies to target an individual customer, and an individual should have access to that bundle as well.”