TheDrake, I agree on the risk of bias, everyone is going to see the anecdotes as confirmation of whatever they already wanted to believe, particularly in an environment where the hard data is suppressed, or worse (from a cynic's point of view) only leaked where it helps the person that controls it (which is why I discount heavily FB supporting claims that seem to use inside info).
On your last point, that was something I alluded to at the top. FB's legal protection - the idea that they have no liability for user content - is really premised on the idea that they are NOT picking and choosing for a view point, that they are reactive and not proactive, and that ultimately they "can't" prevent certain content from appearing. I think we may be seeing the end of that regime if this keeps heading the way it appears to be going, hard to claim you can't control content that's illegal when you're actively demonstrating you can control it when you want to, for political reasons.