For posting:
- invitations to games (you can also use the New Game menu)
- 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)
dresali: You must be talking about offering a draw with your move. I believe you can also offer a draw without moving. (Of course if your opponent does not answer the draw, you will still need to make your move before the time expires.)