You have to do your due diligence even with Paypal. If a stolen credit card is used with Paypal, they'll still take that money back from you. Always have at least two different way of contacting the buyer before you ship to them. Remember, there ain't nothin free in this world!!
my brother tried to sell a phone on craigslist, 3 tries later he gives the phone to me and asks me to sell it on ebay for him. He kept attracting those Nigerians, lol