For posting: - invitations to games (you can also use the New Game menu or go straight to the Chess Invitation) - information about upcoming tournaments - discussion of games (please limit this to completed games or discussion on how a game has arrived at a certain position ... speculation on who has an advantage or the benefits of potential moves is not permitted) - links to interesting related sites (non-promotional)
Generally it's bad manners to offer a draw in an inferior position, in effect this means that if a draw offer is refused the opponent thinks that their position is better, ie no consecutive draw offers by either player.