There's a new Facebook scam that is being sent as a private message from a friends account (now compromised) saying "Did you forget about me?" with a link attached.
Need we remind you not to click links in messages if they look in any way suspicious?
We would always say don't click any links at all that arrive in IM's,emails, tweets etc
There's also another scam on Facebook asking for money to be wired to a friend who has "just been mugged" and had all their money etc stolen. You will normally know this person, and therefore it should be relatively simple to know if this is suspicious, which for the security aware amongst you, it will be.