Even as a Facebook cheerleader, we think not enough sites are giving Facebook a hard time about the true portability of its users.

50 Million active is still a low number worldwide, which means that any all-web network will have a tough time reaching enough customers to be viable. Believe it or not, TechCrunch does the best job at being the buzz-kill.

But the flurry of rumors make one thing clear.

It’s obvious where all the zeros in that 15,000,000,000 valuation are coming from.