Hi all, I'm a bit of a newbie in terms of business and advertising (I know the acronyms; just no real experience yet!), and I have a pretty simple question: I'm developing a free web service to be distributed through a web-app. There are two groups of users: the services for one group are free, and all but one of the services to the other are also free. I was hoping to monetize traffic enough to cut even with server costs, and I was wondering: Is it against the ToS of any of the major ad networks to place ads on the control panel of a web service? Would you suggest CPM or CPC advertising? And (the kicker) which ad network do you believe would help me best monetize traffic?