Startup Idea : Has supply / needs demand (tag match, social net)

I have an offer for someone who needs something I've got. BUT... ... how can we find each other fast?! Let's create a website with tags matching people fast, like: I offer: [money for ideas] mached I need: [money for ideas] I offer: [job for plumber] mached I need: [job for plumber] I offer: [waterproof blue coat] mached I need: [waterproof blue coat] I offer: [unfurnished room in Berlin] mached I need: [unfurnished room in Berlin] [ ] - tags in square brackets. Other points: adding photos available, contact details, price... BTW: I need also a website with safe micropayment system implemented (coin for button press). If someone can help me with it - plz contact me here under or via www.dryhay.eu (email contact is the best contact with me).