[icebraining]

your FB friends are supposedly people you know in real life and trust

If the FB developers think that's generally true, I'd say they are pretty incompetent. Even my parents, with just a couple dozen friends, have FB friends they have never met, let alone my teenage brother and his friends, who have hundreds of FB friends each.

This is usually not a problem, since they don't post sensitive information on their timeline, only in the chat to specific people.

[monkeyprojects]

It probably actually is a problem but most people don't realise it.

Even when people are incredibly careful people do unwittingly post things that allow others to identify them. They may not reveal much in any individual post but when you combine a few together its a problem.

1 prime example is a friend who posted an invite to a house warming party then a week later posted from their holiday abroad...