Zuckerberg has yet another reason to celebrate today as Goldman Sachs and a Russian investment firm fork over $500 million in a deal that puts Facebook's current valuation at something like $50 billion -- up from an earlier valuation of $10 billion.

You'll recall how we informed those of you with means that you can now buy private shares of Facebook and Twitter, and now Goldman plans to create a "special purpose vehicle" for their wealthiest clients to buy a piece of Facebook. The S.E.C. still has to weigh in as to whether this is legit, since companies with 500 or more investors are supposed to go public, but Goldman will argue that their "vehicle" only counts as one investor, with them managing the pool.

Today's deal is expected to allow some long-term Facebook employees to cash out some of their shares in the company, so look for some happy people throwing their money around in restaurants this week.