While most folks using Facebook are "good people", there are always dangers lurking as criminals monitor the site for opportunities (e.g., scams, families posting vacation plans in advance, etc)
Man Posts Facebook Ad and Gets Robbed After Meeting with Buyers
QUOTE: This is another reminder of why you should not conduct business with strangers that you meet on social networking sites like Facebook. A man in Houston who posted an ad on his Facebook account to sell an iPad tablet for $400 fell into the hands of robbers. The two alleged criminals, who were identified as Devontta Dorsey, 18, and Darrell Wayne Broussard, 17 were later caught and charged with aggravated robbery with a deadly weapon. The victim reported that he received a text from an interested buyer on June 25, 2012. He agreed to meet the buyer, who later turned out to be Dorsey and Broussard, at Miller Intermediate School located at 15000 block of Westpark early in the evening that day.