It is the new norm. Craigslist is dead. Always check the users profile. A few red flags would be - Just joined the group, no profile pic, no FB history, no FB friends, no FB posts at all, locked down profile, etc. It's a gut feeling for me. If it doesn't feel right, then it probably isn't. Once you start to carry on a conversation (thru FB Chat) with the potential buyer, you can get a feel pretty quickly if they are legit or not. As mentioned above, I also typically try to have a verbal conversation just to make sure. Especially if it's a higher $$$ item. But... Scammers have been starting to use the FB phone app to contact users, so don't rely on that, you want to get their cell and call it directly. You can probably cross-reference their phone# to confirm it matches the name you are seeing in FB pretty easily. Basically, become a stalker to avoid being stalked. LOL!