Blatant violations of the Invision TOS. Moderators can warn and edit the post. Or if in the Moderators judgment it needs to be removed they can do so.
From the Invision TOS :
a.Content that infringes upon any rights (including, but not limited to, copyrights and trademarks)
b.Abusive, threatening, defamatory, racist, or obscene Content
c.Viruses or any other harmful computer software
d.False information or libel
e.Spam, chain letters, or pyramid schemes
f.Gambling or Illicit drugs
g.Terrorism
h.Hacking or cheating for internet/online games
i.Warez, Roms, CD-Keys, Cracks, Passwords, or Serial Numbers
j.Pornography, nudity, or sexual material of any kind
k.Excessive profanity
l.Content that is invasive of privacy or impersonation of any person/entity
m.Hacking materials or information.

http://www.invisionfree.com/tos/

Spam bots- like the ones that are posting now in SL forum about buying lindens. Those will be delete.

Members that get into arguments that derail threads. Those will be to moved to the Center ring area. This way they can continue on and work out their differences in an area that doesn't affect other peoples posts.

Spam posting by members - will be moved to The Center Ring. This way they can continue on there and if members feel like posting to it they can do so. This would keep them from reposting it 50 times and it's out of the main GD forum.

Excessive Flaming or excessively antagonistic posts toward other forum members. A warning can be issued first by a Mod. The posts could be moved to the Center ring if they are derailing a thread and the posters want to continue it. That's a judgment call by the moderator, if they are racist remarks, death threats and the like. Those will not be tolerated or moved but simply deleted.

Sockpuppets (alt accounts) used to bloster your posted arguments or to otherwise harass other forum members & moderators is not allowed and will be deleted.
(You are allowed to register extra accounts for your alts in their names from SL if you wish. As long as you don't engage in sockpuppetry or harassment with them.)

We encourage you to use your Second Life Name when you register. Or your SL first name only. You can pick another name to use if you want. What you CAN NOT DO is impersonate a known Second Life Avatars Name and post here pretending to be that avatar. If it comes to the boards attention that is being done, your account will be deleted. This is done to protect the members that post here and the unknowing avatars on SL who's name and reputation maybe at risk from impersonation.