The reported $3.8 billion in FB revenue is not an official number. It came from a CNBC reporter who cited undisclosed sources. Official revenue would have to be about $6 billion for FB to have the 16x ratio.
Why the downvotes? The parent poster used $3.8 billion to come up with the $60 billion estimate (3.8 * 16.2 is approx 60). Isn't it true that we don't officially know what Facebook's revenue is? I was merely trying to point out that 3.8 may not be an accurate number. Then I went on to say approx how much revenue Facebook would need in order to have a 16x ratio given the current estimated valuation of $100 billion.