Get People to Promote Your Product on Twitter

Pay with a Tweet is a cool new(ish) tool that allows you to setup a giveaway of some sort (could even be early access to a webapp), but instead of having them pay, they merely tweet on Twitter about it, then are given access. It’s quite easy to use and can be used to give away digital downloads, access to stuff, coupon codes and more. I just wish they’d build a Facebook and Google+ variant/option.