1. ICQ - Noun
2. ICQ - Verb
3. ICQ - Proper noun
ICQ (plural ICQs)
(amateur radio) A call for acknowledgement.
ICQ
(Internet) A program allowing users to send each other instant messages via the Internet.
ICQ (third-person singular simple present ICQs, present participle ICQing, simple past and past participle ICQed)
(transitive, Internet) To send an instant message to (someone) using ICQ.
AIM and ICQ are two early protocols. Source: Internet
Also, you can use the Pidgin client on any "chat" protocol including AIM, Google Talk, ICQ, MSN, Yahoo, and others. Source: Internet
Earlier versions (ICQ 2001b and all ICQ clients before it) used ICQ protocol version 7. *ICQ 4 and later ICQ 5 (released on Monday, February 7, 2005), were upgrades on ICQ Lite. Source: Internet
As a response to UIN theft or sale of attractive UINs, ICQ started to store email addresses previously associated with a UIN. Source: Internet
At its peak around 2001, ICQ had over 100 million accounts registered. Source: Internet
By giving away their ICQ product for free and preventing interoperability between their client software and other products, they were able to temporarily dominate the market for instant messaging. Source: Internet