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Instant messaging systems, such as Yahoo! Messenger, AIM, Windows Live Messenger, Tencent QQ, ICQ, XMPP and Myspace chat rooms, are all targets for spammers. Many IM systems offer a directory of users, including demographic information such as age and sex. Advertisers can gather this information, sign on to the system, and send unsolicited messages, which could include commercial scam-ware, viruses, and links to paid links for the purpose of click fraud. Microsoft has announced that the upcoming Windows Live Messenger 9.0 would support specialized features to combat messaging spam. In most systems users can already block the vast majority of spam through the use of a whitelist.
Source: en.wikipedia.org/wiki/Messaging_spam
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