Although MySpace.com is officially a social networking site, as a practical matter it has been used since its inception for marketing. Music groups were the first to capitalize on it…now every one from lawyers to real estate investors are hopping on the bandwagon.

At some point, however, marketing crosses the line and becomes illegal spamming. MySpace’s parent company just sued an e-mail marketing executive for sending millions of spam bulletins. The big issue is where MySpace will draw the line. For now, at least, it seems that sending up to 300 communications daily is okay. Hat tip to Fusion Web FX.