Online Instant messaging (IM) system began to take off with
ICQ (1996). According to the figure from Nielsen 2006, the first three IM systems and their market share are
AOL (53 million, 51.4%),
MSN (27 million, 26.2%), and
Yahoo! (22 million, 21.4%).In China market, IM began with
QQ in 1999. The initiator of
QQ was inspired by
ICQ. It is simply a
Chinese version of ICQ and provides almost the
same functions as MSN.

Ref.:
1)
http://sersc.org/journals/IJSIA/vol2_no4_2008/9.pdf2)
http://en.wikipedia.org/w/index.php?title=Special%3ASearch&search=icq%2C+msn%2C+qq&button=%26nbsp%3B
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