From Dictionary.com (Am I spamming for dictionary.com, now?):
Spam ( P ) Pronunciation Key (spm)
n. Unsolicited e-mail, often of a commercial nature, sent indiscriminately to multiple mailing lists, individuals, or newsgroups; junk e-mail.
First off, not an email - it's a message in a forum. Okay, the message was unsolicited. All messages in the forum are unsolicited. Commercial? Again, there's nothing sold at the site. There's no pop-ups or ads. No profit. Blah blah blah. Sent indiscriminately? This is a movie forum. Prom is a science fiction adventure strip, which was created in the same vein as science fiction and teen films of the 50's. I thought there'd be some interest here for the strip - as opposed to posting in a NASCAR forum.
PROM is akin to an online street musician playing guitar on the subway. Except there's no hat being passed around...
...sigh...