Do toi commentaire on it as your answer ou do toi go to the persons page? I personally think it's rude to just comment. That means the person has to go back to your page and they have no idea if toi a dit anything back ou not. Idk I'm just derpy like that >:3
I don't commentaire on the mur posts I get, if I'm offline it doesn't appear on my live mises à jour when I get on hours later. I'd rather start a conversation par commenting on the persons mur after they've commenté mine.