So, the fact that Microsoft is rumoured to be paying up to $500m for a 5% stake in Facebook would indicate that the social networking site du jour is worth a tidy $10 billion.
This is, conveniently, the same kind of amount that investor Peter Thiel has suggested the site might be valued at. And it's enough to keep Mark Zuckerberg amply supplied with those Adidas flip-flops he's so keen on.
Given that Facebook currently has 42 million users, a valuation of $10bn means each user is worth $238 - that's about £120 in real money.
Meanwhile, a new traffic report from Nielsen Netratings (reported here by fellow Guardianista Jemima) suggests that not only is Facebook now bigger than MySpace in the UK, but that each user spends two hours 32 minutes on the site each month.
If we carry on our back-of-the-envelope calculations, that would mean that each hour that a Facebook user spends aimlessly poking ex-boyfriends is worth £48 to Mark Zuckerberg and pals.
Does that seem drastically over the top? Or does it completely undervalue the amount of time and energy people spend farting around on the site? I'm not sure - but maybe you've got a better idea.
