Quoted from blondetall:

People who create a second account simply to anonymously bash someone on a thread usually are outed/reported in about 2 posts max. People who get banned and find a way around the IP block are also usually outed in about 2 posts max. Both types get their accounts shut down by the mods pretty quick. Otherwise, most people play by the rules around here. It does help that mods can see everyone's IP on every post on every thread, and Robin is cooking up some new safeguards with the upcoming revamp/updates. Stay tuned for big changes.