Spam

Spam (electronic), unsolicited or undesired bulk electronic messages. There are many types of electronic spam, including E-mail spam, unsolicited e-mail. Mobile phone spam, unsolicited text messages. Forum spam, posting advertisements or useless posts on a forum. Spamdexing, manipulating a search engine to create the illusion of popularity for webpages. Spam in blogs, posting random comments or promoting commercial services to blogs, wikis, guestbooks. Newsgroup spam, advertisement and forgery on newsgroups. Messaging spam ("SPIM"), use of instant messenger services for advertisement or even extortion.