Tipjoy lets you send money through Twitter in a fast, easy, and secure way. All you have to do is sign up for Tipjoy and tweet: p @username $1 (with username being the person you are sending money to). The “p” stands for Payment, like “d” stands for Direct Message.
In order for the money to be received and cashed out, the person you sent the money to must sign up for an account on Tipjoy. Then, when they claim the money, they can cash it out to their PayPal, turn it into an Amazon giftcard, or send money to other people.
Of course, you can receive money too. It’s dead simple and actually very fun.