Yes, that's what I wanted to say too. Perhaps LinkedIn's value of advertising is lower than that of Facebook, but it is still worth something. If the demand for ad slots drop on a particular network, the price of those slots will drop and this would attract marketers back to the ad network again.

If anything, Facebook is in a worse position than LinkedIn when it comes to coping with an economic downturn.

Financial crashes kill hype, not value. The article's pro-Facebook argument is centered around hype, not value.