Tweebay offers an easy and free way to buy and sell your items using the power of Twitter – without asking your Twitter Password. Here's how it works: You follow the Tweebay Twitter user and you’ll receive a direct message to verify your account. Then you can bid on auctions posted on the site or post new listings, you have 240 characters to describe your item and can upload one photo so you need to make it count.

More info: Tweebay