is tribalfusion a pay per install program??

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i see their ads on all the bigger websites which have a traffic like 2000+ unique visitors on their site and i know this is their requirement before any one uses them..are they pay per impression program?because i never have heard of them being pay per install or pay per click service..!!are they?

Triablfusion is not a pay per install program...It is a PPC program like adsense or bidvertiser where advertisers and publishers join together to earn money...But there is a slight difference in this when compared to adsense.... In this website we need to choose how many ads that we need to post in our website..For eg..if we need 2 add blocks we need to specify as 2 at the time of registeration itself..

ohh is it that it is a PPC site? what is the pay rate here and what is the min payout with them?