What is ICQ...???

ICQ is an instant messaging computer program, which was first developed by the Israelicompany Mirabilis, now owned by Time Warner's AOL subsidiary. The first version of the program was released in November 1996 and ICQ became one of the first Internet-wide instant messaging services. The name ICQ is a homophone for the phrase "I seek you".
ICQ features include sending text message , offline support, multi-user chats, free daily-limited SMS sending, resumable file transfers, greeting cards, multiplayer games and a searchable user directory. ICQ6 was launched on April 17 , 2007, and offered a single communication platform that combines the various user options: IM services, free SMS from ICQ to mobile, voice and video communication. The software's new sound gallery was orchestrated by the Israeli psychedelic trance duo Infected Mushroom. Among the new additional features in ICQ6 are Quick IM, which allows users to send a short message without opening a conversation window, a “follow me” service directly to the user’s mobile, a multi-chat service and Zlango support, the animated icons language. ICQ is often used for distribution of unwanted advertisement and spam. UIN is a number which is incremented when a new user registers. This makes it simple to find existing targets for spam, abundance of which forces many users to install antispam-bots for filtering automatically distributed messages.