Call it micro-classifieds. Paul Rawlings, a developer in the UK, launched Tweebay on Christmas Day, a classifieds listings service for Twitter. You use your Twitter account to buy and sell stuff (perfect for those unwanted holiday gifts).~ I honestly cannot fathom why anyone would ever think this is a good idea — we already came up with a way to sell things online. It was called eBay. If your idea can fit into the sentence “a ______ for your Twitter,” it’s probably not very good.