Any communications medium of any value can suffer from the annoyance of spam, not just email. If you value your reputation, don’t consider spamming in any form.

Seth Godin explains why spam is unacceptable – and unproductive.

… the future of marketing is based on permission. It’s based on sending messages to people who want to get them, who choose to get them, who would miss you if you didn’t send them. It’s not easy and it’s not cheap to earn permission, but so what? This is my attention, not yours, and if you want to use it for a while, please earn the privilege.