Making FB APP

Just a quick question, when making a FB app, how would you monetize it? Do you add ads into the app? or send them to a cpa when they use the app? or just post a link onto their wall? or status?.

If you send cpa offers your apps ll get ban very soon , Go with the approved ads by facebook like LSM etc.
If you don't care about the apps and if you can generate tons of start up traffic you can go with CPA offers though.
And if you care about traffic and apps , Better go with CPM .