This is not a farm-related topic, but a friend asked me to explain this, and this is the easiest way to do so.
Start by going to the Home page on Facebook, which should look like this:
Hover your mouse over the Messages menu, and click on it to go to your Messages.
Click on Filtered, and be amazed at what shows up at the left, messages you've never seen and had no idea were there! Apologize profusely to anyone who was inadvertently ignored, and delete the conversations you don't want.
Thanks Facebook, for being my nanny. #eyeroll