There's one nice app for communication - QISS.IM
Check it in App Store.
This app allows you to communicate with all your friends from different social networks through only one app. You can post photos, news (events), links using only one application.Now Qiss.IM supports the following networks: FaceBook, Twitter, LinkedIn, Myspace, Vkontakte, LiveJournal, LastFm, Flickr, foursquare, Bebo, Blogger, WordPress, rss, MyWorld(Mail.ru), and MSN messenger. It's localized in 4 languages: English, French, Spanish, Russian.