IMO, start it immediately....you WILL get negative feedback if you suddenly add them later...and if you are thinking at all of paid subscriptions, implement them immediately as well...even a small token donation that brings a few enhancements to the users AND gives them a little recognition (username color, etc) will help soften your needs down the line.
Many of my users actually appreciate some of the ads, since they can be pertinant to the chitchat discussions.
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