A significant portion of that increase in revenues is due to ad policy changes and deals with branders rather than any type of growth that could be sustainable in the future.
Same amount, same terms? (FB revenue>$2B for 2014 I win, <$2B revenue you win, murky situations go to an HN poll?)
I don't think FB has yet found their revenue-rocket equivalent to AdWords -- current ads are not it -- but I think they will.
What happens to the bet if FB is acquired?
Just express a preference before an acquisition happens, or my preference -- calculate it as a division -- should stand. (I like FB to make this revenue target standalone; I like them as part of Google/MSFT/Apple/Disney/etc.; I like them in a box, I like them with a fox; I like them in a house, I like them with a mouse.)