A new addon Spamalyzer is available, which replaces the addon fubar_addonSpamFu.
Addons like GearScore (it’s badly coded) and Carbonite can spam the crap out of you when other people have them installed. Note this happens even if you do not have it installed. Other users’ addons generate addon chat traffic. It can be very large and cause latency and lag, unless coded properly like Elitist Group is.
Spamalyzer will help you identify spammy raiders so you can tell them to disable that crap asap, whatever it may be.