I mainly ignore stubborn posters, posters whose only goal is to rack up quantity of posts rather than quality, and I keep a mental note of posters who know what they're talking about. Usually people stick to one thing that they know very well - a specialty - but a sometimes on this forum there are those who like to yap about their favorite subject and I ignore them because I'm tired of reading it. I can list the good and the bad who stand out in my mind but we all know who they are anyways so I can save them the embarrassment.