Social network games - and by extension, social networks themselves - received a strong endorsement this morning as a major acquisition was announced.  Electronic Arts has bought Playfish, a maker of said games, for at least $300 million.

Barry Cottle, Senior Vice President and General Manager of EA Interactive, explained in a statement, "Social gaming, with its emphasis on friends and community, is seeing tremendous growth and this is the right time to invest to strengthen our participation in this space."

Indeed, Playfish should make a good partner for EA.  The company describes itself as a leader in the social gaming industry, and has received backing from Accel Partners (which also invested in Facebook) and Index Ventures (which put its weight behind Last.fm and Skype).

Moreover, Playfish claims that over 150 million of its games have been installed.  (Playfish's top games are Country Story, Pet Society, Restaurant City, and Who Has The Biggest Brain? in case you're curious.)

And that large number brings us back to the matter of Playfish's price.  EA's paying $275 million in cash and $25 million in "equity retention arrangements" up front.  Then, as much as $100 million more will be delivered if unspecified performance milestones are met between now and the end of 2011.

Related Articles:

> 20 Goals For Business Social Media Use

> Nearly Half Of Consumers Would Recommend A Product On Facebook

> Facebook Most Widely Used Network Among Businesses