From BuddyFuse: BuddyFuse is a handy extension for Windows Live Messenger seamlessly integrating third party chat and social networks into the world's most popular instant messaging client. You can add your accounts from Google, Twitter and Hyves (a popular Dutch social network). Once you have added your Google account, all your Google Talk chat contacts will be loaded into Messenger. When your friends are online on Google Talk you can chat with them just like with regular Messenger buddies. BuddyFuse can also automatically Tweet your Messenger personal message status updates.
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