cloak it - too much star track in the coffee but this plug-in goes boldly into message protection
Cloakguard is a free browser plug-in that keeps your message private on open social media. You can send a message through Facebook, only the people you've shared your keyword with can read that message.
Select the message you'd like to keep private, pick a Keyword and CLOAK it. Free Download - https://addons.mozilla.org/en-US/firefox/addon/194385/
Free Online tool - http://cloakguard.com/tryitfree.php
Demo - http://www.youtube.com/watch?v=C4qN3TBqx08