MySpace might have quietly slipped to the second position, behind Facebook, on the social-networking charts but it remains a stellar performer when it comes to online display ads.

MySpace emerged as the leading U.S online display ads publisher for the month of June with 51 billion ad views, according to data released by comScore Ad Metrix. Yahoo was a distant second with a shade over 34 billion ad views. The search ads behemoth Google occupied the 5th spot with 5 billion ad views.

As for the top advertiser, the honor went to Microsoft. The company's 5.5 billion display ad views came courtesy its Windows Live Search promotional campaign.