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Relevant rumors first appeared about two months ago, and at this point, the move still isn't official.  It seems a pretty sure thing, however, that Marc Andreessen has joined Facebook's board of directors.

Andreessen will bring plenty of experience to the table.  He co-founded both Netscape and Ning, and his work at another company earned him a spot as AOL's CTO.  Also, Andreessen's enthusiasm for social media is strong enough that he even invested in the business behind Facebook's FoodFight app.

 Marc Andreessen

Andreessen's connection to Ning has been pointed to as a possible conflict of interest in this latest development; the company's tagline is "Create your own social network for anything."  But in reality, Ning and Facebook aren't often mentioned in the same breath.  It's conceivable that a Ning-Facebook deal is on the way, as well, and regardless, Andreessen and Mark Zuckerberg are known to be friends.

Michael Arrington reports, then, "The board position Andreessen has taken is one of the two vacant common stock seats Zuckerberg controls in addition to his own seat.  One of those seats has never been filled.  The other was previously held by former Facebook President Sean Parker, who left the company in late 2005."

So it looks like Andreessen will function as a much-needed warm body, too.