Popular chat/instant messaging service app IM+, now has a free version for PlayBook in the BlackBerry App World. There is also a paid version of this app called IM+ Pro, which is available for the price of $7.99 (USD).
IM+ for PlayBook allows you to chat with your friends on Facebook, MSN/Live Messenger, Google Talk, Yahoo!, AIM/iChat, ICQ, RenRen, Jabber, mig33, SINA Weibo, Fetion, Mamba.Ru, VKontakte, Yandex IM, Odnoklassniki.Ru and Mail.Ru.
IM+ for PlayBook can send text messsages, photos, and voice notes for free. IM+ for PlayBook has some nice features like Group chat in MSN, AIM, ICQ, Multiple accounts per service, Chat history.