I'm not on Facebook (I only go on lovely Mudcat) but several of my friends are. From what I hear, it's a minefield of personal details of one's life being broadcast to friends and friends-of-friends, and eventually perfect strangers.

It seems to engender an enormous amount of distress and anger. Even my sister (who should know better) finds it a Bit Much at times, but nonetheless keeps at it, 'de-friending' and 'friending', tub-thumping about SNP antics and so on.

As far as I can see, it facilitates stalking, rumour-mongering, disseminating viciousness and lies, and boasting. ('Here is a photo of the pile of presents we got our little Johnny this Christmas' 'Photo of our brand new Mercedes' etc)
Even my husband is on it, and tells me he has about 300 'friends'. Daft banana!
The way to avoid being enraged by evil remarks on Facebook is never to venture there.