Watch Ads in put up ads!

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A while ago there was a website(i forgot the name) that let you watch a certain amount of ad's in order to put your own advertisements up to get views aswell. I'm looking for something like this. In the other one, it would sit there and scroll through the ad's and automatically go to the next one when time was up. I would like to know if anyone one of you know of a similar site i can use?