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Trillian
The ultimate instant messenger. Trillian lets you connect to multiple IM and social networks at the same time, managing contacts and real time status feeds efficiently.
This is a CE favorite. Connect to multiple Instant Messenger all with one program. Includes: Yahoo, AIM, ICQ, MSN- and now social media such as Facebook and Twitter. This program has been around for years but keeps getting better and better.
They offer a free version and a pro version.
More information and download here: