I'm always getting messages from friends, but I also get them from from strangers that look like they want to sell me something. Are they all scams or could some of them be good deals? How can I tell the difference?
Spam may not be necessarily scam. If the offer is good better check feedbacks about the seller and pay via credit card so you can file a chargeback in case the transaction turns out into a scam.
Friends aren't going to send you constant bulletins telling you to click here for deals on ring tones, dating, etc., and they certainly aren't going to put those messages in your comments. If you get those or profile tracker ads it is definitely spam.
i think that you can notice fake people when you look for their friends. they they have got 1000s of friends and the photos dont seem to be real, it is a fake account.