The data scientists at Facebook have pretty much free reign to pull down whatever data they feel they need and often do. As much as there's talk about how much of a no-no that is there, it doesn't seem like anyone is really looking.

You should be a lot more worried about Facebook.

This pretty much applied to US government warrantless wiretaps as well come to think of it. Unfettered access isn't so hot if you like your privacy.