Facebook is raising $100 million in debt, reports VentureBeat and Business Week. bringing their total capital raised to nearly half a billion dollars.

This most recent round will be used to scale the service via another 50,000 or so servers. Facebook now has over 70 million active users and around 109 milliion monthly visitors, and the site is at times very slow.

Compare that to Google, which operates at least a million servers (and is adding 500,000 per year, says Business Week), and Microsoft, which is adding 200,000 servers per year.