Messaging spam, sometimes called SPIM, is a type of spam where the target is instant messaging services.
Instant messaging (IM) systems, such as Yahoo! Messenger, AIM, MSN Messenger and ICQ, are popular 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.