Mobile phone spam
Mobile phone spam is directed at the text messaging service of a mobile phone. This can be especially irritating to consumers not only for the inconvenience but also because they sometimes have to pay to receive the text message.
Internet telephony spam
It has been predicted that voice over IP (VoIP) communications will be vulnerable to being spammed by prerecorded messages. Although there have been few reported incidents, some companies have already tried to sell defenses against it. 
Online game messaging spam
Many online games allow players to contact each other via player-to-player messaging, or chatrooms or public discussion areas.
What qualifies as spam varies from game to game, but usually this term is applied to all forms of flooding the game with messages; in case of MUDs, the problem is usually the same as with other chat services.
Many games have strict rules on what kind of communication is acceptable in the games. Frequently, the terms of service don’t allow promotion of external websites except on very strict terms (for example, URLs may be allowed on player profiles, but not anywhere else), and promotion of websites in-game is usually very much frowned on in any case.
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