RevTwt, formerly TwtAd, is Twitter advertising network which covers over 20 million followers.  They compensate advertisers with classic CPC (”cost-per-click”) advertising, CPA (”cost-per-action”) and what they call CPT (”cost-per-thousand”).  CPT allows members with a minimum number of followers to receive a fixed fee for holding an ad for 72 hours in their Twitter timeline.

RevTwt’s FAQ reports that advertisements earn members 4-20 cents per “valid” click for CPC.  Members have the ability to select ads or use an Auto-Post feature. CPT ads appear to have a lot of restrictions, which is not surprising, considering the high potential for abuse.

There is significant explanation of clickfraud in the FAQ.  Over-reporting of clicks led to a site revamp in May with CPD (”click-fraud-protection”).   The site has changed hands a few times, here’s a quote regarding the various developer/owers:

RevTwt is a business unit of Wizag LLC, an incubator and holding company. The RevTwt website was formerly known as Twtad.com. TwtAd.com was first developed by a young Internet entrepreneur Luke Kling in March 2009, who passed it on to another young Internet entreprenuer James Simpson. Wizag acquired the website from James in late April 2009. 

Traffic seems light.  Quantcast estimates them at 7k users per month, although growing quickly as the site launched with it’s new domain in late May 09.