SGN is announcing this morning that Bezos Expeditions, the personal investment company of Jeff Bezos, has invested in the company. The terms and size of the deal were not disclosed. The investment comes only two months after the company announced a huge $15 million Series A round from Greylock Partners, Founders Fund, Columbia Capital and Novak Biddle Venture Partners in May.

SGN says it will use the funding to “continue to push the envelope on the quality of games being produced on the social web, with the vision of connecting people in a way never experienced before.”

“We are proud to be announcing the Bezos Expeditions investment,” said Shervin Pishevar, CEO of SGN. “Mr. Bezos’ knowledge and experience lends itself to the growth and expansion of the social gaming ecosystem. His participation in our funding will allow us to continue capturing new demographics in gaming by distributing the highest quality games available on the social web.”

“SGN has the expertise to bring gaming into entirely new markets.” says Steve Campbell, CIO of Bezos Expeditions. “There’s an obvious benefit to gaining such deep traction in the social networking area.”

As a fellow investor in SGN, Greylock Partners‘ David Sze today said “SGN is a force to be reckoned with in the gaming space. We are looking forward to Bezos Expeditions joining the SGN investors group.”

Now with Bezos on board, SGN has built an even stronger investor group. David Sze is a board observer at Facebook, and Founders Fund‘s Peter Thiel holds a board seat. Bezos has also made investments in Pelago (makers of Whrrl), Twitter, Kongregate, TeachStreet, Powerset (recently acquired by Microsoft), ChaCha and 37signals.