Unless you say gm through out the whole day… but if you are really concerned that they are going to figure out what hemisphere you are in, you better change up all your online interactions, because they can easily watch your replies and your posts and establish your hemisphere just by the times of your interaction and patterns… if Amazon’s algorithm can establish whether some one is pregnant just off you searches of their website, there are plenty of programs out there that can establish simple patterns to determine what side of the globe an anonymous account originates from if they cared.