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How do i put to see who is online

PostPosted: Mon Sep 02, 2013 3:49 am
by wtfstudios
Ok, so I created an app to help people around to see if there's police in the specific area, My app monetization rely on the ad I put. So the help I need is how to make people see who is using my app, online.
Like in realtime , because the advertisers need to know how many people are online.
Many thanks.