Despite adamant denials of its existence, a Facebook insider has provided ValleyWag with a look at the social network's advertising rate card.

The site's management long maintained that such a card, which sets out ad rates for potential buyers, did not exist, except in fevered imagination. But now there are actual screenshots of the quixotic item:

While most ads are sold on a standard CPM basis, a sponsored group on Facebook will run advertisers a cool $50,000 minimum. And that comes with a three month commitment.

The rate card is from February, before Facebook opened its API to all developers, suggesting rates now may have significantly changed.