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Facebook is so large that it now accounts for about one out of every three ad impressions in the U.S., according to the latest statistics from comScore Ad Metrix. In the first quarter of 2011, comScore estimates that 1.1 trillion ads were served to U.S. Internet users, and 346 billion of those (or 31 percent) were on Facebook.

Spending on U.S. Internet ads rose 15% to $26 billion last year, outpacing traditional media and surpassing newspaper ad revenue for the first time.

Most Internet analysts suggest that MySpace fell from grace because it crumbled in the face of stiff competition from Facebook. But a Reuters report suggests that it may have been Google that dealt the fatal blow by accident as long ago as 2006.

In the wake of AOL's deal to buy the Huffington Post, some marketing executives are expressing concerns about the liberal-leaning nature of the website and its potential to taint the broader AOL brand.

The deal would give AOL a major presence in journalism, demonstrating the company’s intention to rely more heavily on online advertising.

Facebook users who check in to a store or click the "like" button for a brand may soon find those actions retransmitted on their friends' pages as a "Sponsored Story" paid for by advertisers....

As Goldman Sachs pours $450 million into Facebook, Japan, with a large and growing online advertising market, is a big hole in Facebook’s global fabric.

This year, for the first time, advertisers will have spent more on Internet ads than on print newspaper ads, according to new estimates from eMarketer.

MySpace and some popular applications have been transmitting information to outside advertising companies that could be used to identify users, a Journal investigation found.