Seriously, how much is Facebook worth? It's been an enigma in tech gossip for years now, as the social-networking company grows bigger and bigger and yet remains privately held. And some of Facebook's most rapid growth has taken place in the midst of a stormy economic climate that could batter any company's balance sheet. So here's a rundown of what tech blogs, news outlets, investors, and Valley gadflies have said thus far about just how much Facebook is worth.

Are all these numbers accurate? In a word, no. Some of them were rumors (albeit decently strong ones, as we've omitted some of the more ridiculous ones), and others refer to Facebook's preferred-stock valuation, which as we learned during its legal tiff with onetime rival ConnectU, that isn't necessarily anywhere close to the company's paper valuation.

One thing that's interesting: Take a look at the trajectory. Facebook's perceived valuation keeps climbing and climbing and climbing right up to its $240 million investment by Microsoft. Then, once the hype dies down (and the market starts to sputter) it tanks. It's not until, perhaps not coincidentally, the departure of chief financial officer Gideon Yu and the stronger likelihood of a new investment round that Facebook's valuation starts to climb again.

What's next? Digital Sky Technologies' investment in Facebook assumed a preferred-stock valuation of $10 billion, and employee stock trades have started at about a $6.5 billion valuation. It's not yet clear how much more the company's worth will fluctuate before, at long last, founder and CEO Mark Zuckerberg and his team decide to take it public. That is, of course, assuming that actually happens.