It's pretty apparent that yahoo has gone with a totally non human moderated forum software system, complete with filtered words, simplistic grammar. No humans needed. Auto spell checker, auto grammar including stupid capitalizing parameters. The forum software doesn't even tell you your post can't be posted. Omitting links makes it easier for the robot program, as well as automatically eliminating any flood spamming. Yahoo has no concerns for people themselves. "We don't want to hear from you, if you don't like our rules, don't join or just leave".
