Revenue isn't really relevant when you're losing money as fast as Linkedin. They have no real competitors, and they still aren't able to turn a profit.

Even $3 billion is to much.

They're not losing money all that fast and are spending heavily on growth. They also have a lot of money in the bank ($3.1B in cash and short term securities) so that's pretty much exactly what it's there for.

Their net income is 0.6% of their valuation.

They loss money, right?

That valuation should be for more like $3B in profit!

Based on the Yahoo link it looks like they lost money this year and last.

With a $-166 million Net Income.

That's revenue. They made no profit for that year and actually ended up losing money.