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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.

Politicians and privacy experts demanded answers of Google and Apple Friday following the discovery that smartphone software from the tech giants regularly transmits information about a user's whereabouts back to the companies.

Amazon will lower the price of its electronic reader by showing ads as screensavers and at the bottom of the home screen, and by selling special offers.

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.

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....

First they showed up in your e-mail. Then they found their way onto Facebook. Now ads are coming to your checking account.

Akamai’s real-time ad targeting solution could well be an important growth driver in the future for the company given the growing importance of behavioral targeting technology in the context of web advertisement. Companies such as Amazon and Google currently use similar technologies to identify user behavior and then offer suggestions or products that might interest users.

Federal regulators are proposing to create a "Do Not Track" tool for the Internet so that people could prevent marketers from tracking their Web browsing habits and other online behavior in order to target advertising....

Facebook said its head of advertising sales, Michael Murphy, is stepping down in December, leaving a vacancy in one of the social-networking giant's key positions.

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