Could “craigslist”:http://craigslist.com/ be in trouble? Social giant facebook’s new “marketplace”:http://facebook.com/marketplace feature will combine the social function of its site with an internet-based community marketing forum in which individual users can buy and sell anything from each other. Of course, this function is perfect for facebook users who are already self-organized into local city, company, or university networks. By combining the business functions with the social network, facebook could bring even more people into internet bartering/trade, assuring everyone on both ends of the transaction accountability. If you’re a facebook user, check out your local marketplace “here”:http://facebook.com/marketplace and see what’s for sale.