Social networks and their endlessly growing page views have dominated every sphere of the web -- from audiences to ad impressions. But there's one area where they still can't seem to catch up: ad prices.

A recent analysis by ComScore shows social networks, primarily Facebook and MySpace, have over the last year drawn an average CPM of only 56 cents, compared to the $2.43 average for the internet at large. Looking more closely, the ComScore data show that the average pricing for online ads exclusive of social-networking sites, namely Facebook and MySpace, would be much higher, about $2.99 for every 1,000 views; social sites dragged down the average online CPM by as much as 18% over the last year.

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