A great profile of LinkedIn, with some juicy data points, on Forbes:
There’s no better way to understand LinkedIn’s quiet savvy, in the midst of Facebook’s noisy clatter, than to compare the two sites’ financial efficiency. With ComScore Web-usage data and public financial filings, it’s now possible to figure out how much revenue the two rivals collect for every hour that each user spends on the site. LinkedIn’s tally: $1.30. Facebook’s: a measly 6.2 cents.