Trade chat messages that are long often take up the whole visible chat box (without pressing chat key or scrolling). It's annoying. Obviously there is /ttoggle but I am still interested in seeing ads because I like to find out where I can buy things. Somebody suggested a character limit and I am all for it. Links for meepcraft.com are a special case because they can often be long yet should not be subject to this filter if they are over the limit.