Furthermore, you may remember that Facebook’s (often disputed) $15 billion valuation was forged back then in 2008. Now that their user base has doubled, is the valuation still unreasonably high? Or, perhaps, unreasonably low? Despite the economic recession and the press raving about Facebook being unable to turn a profit, while they’re growing at this rate, I don’t think Mark Zuckerberg’s hair will turn gray any time soon.

To celebrate, Facebook has started a charity campaign. Users can go here and share their stories about “how Facebook has helped them give back to their communities, effect change or connect with a distant relative.” They’re working together with 16 charitable and advocacy organizations that have created gifts, available in Facebook’s gift shop. Buy a gift, and 90 to 95 percent of the cost goes back to the organization represented by that gift; Facebook won’t keep any of the money for themselves.