Google Talk

Very easy to use. Definitely won't make your computer heavy. Just 2mb installer.

Text chat

• Instant messages: share quick thoughts in real time
• Status updates: see if friends are around and what they are up to
• File transfer: instantly send and receive files, pictures, and more

Voice chat

• Free long distance: make PC-to-PC calls to people anywhere in the world
• Audio conferencing: talk to multiple people at once
• Gmail integration: chat with your friends on Gmail

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