Instant Messaging Software

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http://stackoverflow.com – What are the best instant messaging software available to add to the app (iOS, Android, Windows)? We are looking for a Sports Yapper like messaging capability to add to the app. Jabber D is one solution we found. Can anybody recommend any other? What would be some qualifiers/requirements check for such service? This solution has to be able to pull users together from social mediums and be able to create groups to chat with. Sports Yapper - allows you to instant message with friends by inviting them into conversation via your facebook or twitter account. Thank you in advance (HowTos)