Number of employees at 'web' companies

A friend of mine was at a search engine strategies conference last week, and sent me these employment numbers, which are really staggering:

  1. Skype has 200 employees
  2. YouTube has 60 employees
  3. Craigslist has 20 employees

(I think those numbers came from Nicholas Carr, but I'm not positive.)

I would have guessed at numbers much higher than those. Hopefully that makes everyone at YouTube a billionaire, or at least a millionaire.