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In the year 2011, the estimated figure for spam messages is around seven trillion.The costs, such as lost productivity and fraud, are borne by the public and by Internet service providers, which have been forced to add extra capacity to cope with the deluge.

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As the waiter recites the Spam-filled menu, a chorus of Viking patrons drowns out all conversations with a song repeating "Spam, Spam, Spam, Spam… In early chat rooms services like People Link and the early days of Online America (later known as America Online or AOL), they actually flooded the screen with quotes from the Monty Python Spam sketch.

With internet connections over phone lines, typically running at 1200 or even 300 bit/s, it could take an enormous amount of time for a spammy logo, drawn in ASCII art to scroll to completion on a viewer's terminal.

Spamming remains economically viable because advertisers have no operating costs beyond the management of their mailing lists, servers, infrastructures, IP ranges, and domain names, and it is difficult to hold senders accountable for their mass mailings.

Because the barrier to entry is so low, spammers are numerous, and the volume of unsolicited mail has become very high.

The first major commercial spam incident started on March 5, 1994, when a husband and wife team of lawyers, Laurence Canter and Martha Siegel, began using bulk Usenet posting to advertise immigration law services.

The incident was commonly termed the "Green Card spam", after the subject line of the postings.

Sending an irritating, large, meaningless block of text in this way was called spamming.

This was used as a tactic by insiders of a group that wanted to drive newcomers out of the room so the usual conversation could continue.

The first recorded instance of a mass unsolicited commercial telegram is from May 1864, when some British politicians received an unsolicited telegram advertising a dentistry shop.

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