((Tread)) Don't participate in FB warfare. It is classless. You have much better things to do than stoop to Jr. High School antics. Once you put words on the Internet.....it's there forever. The more you try to beat her in a FB competition, the more you are showing everyone that you are consumed with thoughts of her and what she has done. The best thing you can do is leave it alone.
Your anger is a normal response, IMHO. I'm not suggesting you shouldn't feel like you do. I can speak from experience when I say to be careful how you deal handle the anger. Please find a more healthy source to get that mad pent-up steam out of your system. Get a boxer's bag and punch the daylights out of it. Run until you drop. Do pushups until you fall on your face. But try to work out your anger in a more productive and healthy manner. Don't fall into the temptation of FB warfare.
Focus on your integrity. Your son is watching to see how a man of honor reacts to such a horrid act of betrayal. Show him how to hold your chin up, walk & talk with dignity and grace.
I'm so sorry for the pain in your life and the suffering your family is experiencing. You will get through it. You will be okay.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!