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Forum Moderators: rogerd
Just keep deleting their accounts and posts, they will soon get the message.
You want to contact Ghost websites and link with them. Use PPC to drive targeted traffic and new members, and seo it, so the post headings get into the main engines.
For some reason spambots seem to like empty and very low use forums. If you don't have a lot of actively posting members yet (and seeing tons of spam will certainly send some of them elsewhere), keep the number of forums/subforums lean and mean so that they all have regular activity. As I'm sure you'll read in the threads rogerd linked to, this also makes the forum "feel" busier so people are more likely to want to join in. As posting increases, you can add more subforums by splitting into narrower subject areas.
[edited by: Beagle at 1:37 am (utc) on Sep. 25, 2007]
The few good posters can get a V.I.P status which basically just means that they can post whatever they feel like - the rest initial posts (topic at hand) has to be "accepted" by a moderator.
Make a lower limit on how many words are needed to actually post something on the first post (topic at hand) to start with - for instance 200 words minimum or it just gets "can't do that - 200 words minimum" - bots will hate you since they usually just use a standard message..
Implement a karma system .. where people can vote eachothers topics up and down and affect eachother .. if somebody gets too much bad karma - their initial posts aren't on the top - they start in the middle instead .. and so on...
[edited by: RandomDot at 8:23 am (utc) on Sep. 29, 2007]