The following was recently added as a clarification:
Of particular note is the Wikipedia definition of forum spam:
Taken from: http://en.wikipedia.org/wiki/Spamming#N ... Forum_spamSpamming an internet forum in general, is when a user posts something which is off-topic or doesn’t have anything to do with the current subject. Also, a post that doesn’t contribute to the thread whatsoever is also considered spam in some cases. A third form of Forum Spamming is where a person repeatedly posts about a certain subject in a manner that is unwanted by (and possibly annoying to) the general population of the forum. Lastly there is also the case where a person posts messages solely for the purpose of increasing his or her ranking on the forum. In a broader sense, advertising on forums where it is not wanted is known as spamming and is generally seen as an annoyance.
In the best interests of the community, our moderators take a strong view of forum spam, and will do all they can to prevent it. We look forward to everyones cooperation as we work together to create a safe and friendly community. It must also be noted that by and large the majority (99%) of our members are a pleasure to work and are doing the right thing. Keep it up!