Steve Jobs had opened the path, ex-Googlers followed.

"10% of Facebook employees came from Google":
http://www.insidefacebook.com/2008/03/27/facebooks-dna-is-10-google/

They also missed:

http://www.social.im/

<< Yan-David [Yanda] Erlich – Founder & CEO: Yanda worked as a product manager at Google in both the company's advertising and consumer web products divisions. Before that, Yanda held software engineering and program management positions in Microsoft's consumer-facing MSN group. He's also one of the original founders of Connexions, a non-profit collaborative environment for publishing and sharing educational content. Yanda has an MBA from Stanford's Graduate School of Business and Bachelors of Science in both Computer Science and Electrical & Computer Engineering from Rice University. >>

Also backed by Xoogler angel investors, including Aydin Senkut and Georges Harik.

Info: http://www.social.im/team.html