Orbitum is a Chromium-based web browser that has a built-in chat client for Facebook, Vkontakte. The chat window stays on the side of the the program so that you can browse the Internet while chatting - there is no need to shift between tabs to read messages. It contains a window that displays the list of your friends from social networks, so you can quickly read and reply your private messages.
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Guys, there are also some great browsers [like Fireox, Opera, Chrome, etc.] you should try before using that kind of copy / past Chrome browser.