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AOL Instant Messenger
AOL Instant Messenger
1997
AOL unveiled Instant Messenger soon after its purchase of ICQ. With IM, users can communicate with each other in real time, meet in chat rooms, and share files instantly. IM accounts revolve around "Buddy Lists" of users' friends that show each person's online status.

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Last updated March 26 2008: 10:19 AM ET
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