No doubt you know all about this and other Facebook data scrapes and breaches by now but this cartoon explanation, by Eleri Harris and Andy Warner at The Nib is a useful explainer.
Note: I had an early Facebook account but dumped it after a year as I didn’t particularly like the Facebook design and found it less than useful. When Facebook bought Instagram I dumped that too. To me, there’s something questionable about social tools that attempt to pull people in by appealing to their desire to become more popular. Yes, I realize that Facebook and Instagram are more than that, but these (popularity) tools are deeply engrained in their designs. What people will do to become and remain popular is bothersome to me. Flickr does this and I ranted about it a number of years ago: Flickr Explore.
Of course, WordPress (this site) does this as well… Sigh.