Facebook has revenues of $500M/year - which allows them to be cash flow positive, no word on how much profit. To be worth $50bn, 100x as much, it needs to find

Facebook has revenues of $500M/year - which allows them to be cash flow positive, no word on how much profit. To be worth $50bn, 100x as much, it needs to find 100x as many users or earn 100x as much per user. BMW has $50Bn of earnings for selling 1M cars/year to make twice as much it simply has to sell 2M cars