5 of 13
BACK NEXT
ICQ
ICQ
1996
Short for "I Seek You," ICQ was the first Internet instant messaging system. Each person on ICQ is identified by a unique number called a UIN. ICQ was developed by an Israeli company called Mirabilis, which was subsequently acquired by AOL.

NEXT: AOL Instant Messenger
Last updated March 26 2008: 10:19 AM ET
* : Time reflects local markets trading time.† - Intraday data delayed 15 minutes for Nasdaq, and 20 minutes for other exchanges.• Disclaimer