Earn Money with Twitter

Nowadays that Twitter is one of the most used applications on the web, there are some ways to eran money with Twitter.
One of these ways is RevTwt, a simple way to earn money using your Twitter account.
The only thing you have to do is to post text ads and earn money every time someone clicks on the ad.
They pay you via Paypal every time you reach $20, and it is a really easy way to earn money in autopilot.