One hard to solve problem is character sets - tedious but feasible to write portably in an extended Roman script like Turkish or Vietnamese; anybody's guess what will happen if you post in a different character encoding, the forum engine wasn't designed to handle that in a browser-independent way and people have tried all sorts of incompatible tricks over the years. Even Russian can't be done reliably; Chinese is much more difficult. (Also needs a moderator who can read it).