This is certainly a personal choice and one that Facebook Chat lets you have.You can easily toggle your message notification option on Facebook Chat.Some people like to have a sound play every time they get a new message on Facebook Chat or any other IM or email program for that matter.Some don't want their computer making noises all day long.
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There is also the concern that your Facebook account can be hacked into.
Then again, nothing is really sacred on the Internet.
A moon means that they haven't been online for at least 10 minutes.
Click on the name of someone who has a green dot next to their name. Just type your message into the box, hit enter, and you've started a chat.
Private Facebook posts and private emails have been made public many times and embarrassed the account owner.