Selling for a Cause

Facebook recently revamped and relaunched its Marketplace as a "social classifieds" application, thanks to help from Oodle, an online classifieds startup founded by former eBay and Excite executives.

Facebook members can post items for sale on their profiles, where their friends can comment on them, share them with their friends and click "like" to voice their approval — same as they can for other posted items. In order to post items for sale, members must answer the question "Why are you selling it?"