TC has paid sponsorship slots that cost $10k/mo and there's 10 of them now.

http://www.techcrunch.com/advertise/

He also has quite a few other ads running as well. He's making an incredible amount of money and has been for years now. Selling your own ad space is by far the most profitable way to make ad money.

Facebook is making bringing in alot more then 214K a month via their self service social ads alone. I've spent a few thousand there over the past couple weeks, and I know alot of other people who have. Profit? of course not, but revenue definitely.

umm here is the reference:

http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/10/21/...

facebook brings in 4-5 mil a month according to wikipedia