Facebook - a source of scams

Facebook is a great Web 2.0 social networking site. What better way is there than to have a group of friends and follow what each other is up to and what they are viewing/doing online?
Have noticed, however, that several of my friends have been scammed. That is, their account has been hijacked in some way.
The way this happens is that they click on an interesting Facebook entry on a friend's post - but they are opening themselves up to having information stolen, "liking" something they really don't or some other unwanted occurrence.
Thanks BlogHerald for posting this graphic of Facebook scams (and Bitdefender):
(click to view and then C+ it)