As with most websites, scams are always abound. However, if a facebook scam were to acquire your email and password, you could be exposing personal information to hackers and phishers. This can lead to identity thieft and other public damage, concidering the scammers now have access to one of your most capable forms of communicating with your friends.
Thousands of these sites go out on a daily basis, but since every little bit helps, its important to get word out about all threats. If you get emails, messages, or any links to any part of sites like: goldbase.be, greenbuddy.be, silvertag.be, yospace.be (thanks, Philip), or picoband.be, ignore them. I can’t stress enough how dangerous sites like these can be. I recommend using browsers like Firefox and Google Chrome that automatically block suspicious phishing websites, and warn you when you attempt to access content on their sites.