First of all, it does not matter if you are using e-mail, InMail, Facebook, twitter, private messaging, or an instant messanger; you should always double check that any message that you are sending is going to the intended recipient. For example, you would not want to send a message to your boss that is intended for your spouse!
Secondly, you should make sure that you have a recipient to send your message to before you try to hit send. Most programs will not allow you to send a message without a recipient, but you should always check.
Lastly, you should make sure that you have included everyone who you want to send the message to. If you have to retype and resend the message, then you may forget some detail or the recipient may realize that he or she was left out and be offended.
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