They've never confirmed they're doing ads. But I would think something similar to in game items would work great. Aviary for instance has a great set of standa

They've never confirmed they're doing ads. But I would think something similar to in game items would work great. Aviary for instance has a great set of standard filters, and some "extras" you can buy. I have already purchased one. Would I have clicked on an ad anytime in the next year? probably not