While IM+ is still waiting for their PlayBook IM+ client to be approved Arturo managed to sneak PlayJabber by the App World reviewers. PlayJabber is a bare bones Jabber chat client for the BlackBerry PlayBook. In case you don’t know what Jabber is then let me explain. Jabber is an open source standards for real time chat that many companies like Google, Facebook, and LiveJournal have use to power their chat clients.
In short that means you can use PlayJabber to chat on Google Talk, Facebook, and LiveJournal from your PlayBook. I cannot promise it will work for you but Google Talk worked for me.
You can pick up PlayJabber in App World for a reasonable $1.99