Google unveiled OpenSocial earlier this week and disclosed that social networks such as LinkedIn and Friendster joined the program as well as some of the biggest independent developers on Facebook, including Slide and iLike.

Google lost out to rival Microsoft Corp last week, when the software maker took a minority stake in privately held Facebook and shored up its position as the site's advertising delivery partner.

But that has not cooled investor enthusiasm for Google, based on the expectation it will succeed in extending its dominant technology for selling ads tied to search listings to many new platforms -- from mobile phones to television.

Google shares surged to an all-time high of $713.72 on Nasdaq on Thursday, before closing at $703.21, down $3.79.

Facebook, now valued at $15 billion with the Microsoft deal, is due to unveil an advertising platform at an event in New York next week.

Google executives said the company had also reached out to Facebook, and hundreds of other sites, about joining its OpenSocial platform. Facebook representatives had no immediate comment.

(Reporting by Amanda Beck; writing by Michele Gershberg in New York)