Here is one - http://modeltxt.trafficspaces.com/advertise/

You can see some more examples at http://demo.trafficspaces.com/setup/ There is a preinstalled account there.

The Facebook Ads analogy was just to illustrate that publishers can create a branded self-service ad system just like Facebook does for its advertisers. We didn't mean it functions exactly like Facebook. :)

Anyway, thanks for the feedback siong1987. Much appreciated.