"Just that my boy is so adorable in those pictures...makes me all emotional"
This is apparent by your desire to need to comment. This is a hard time man, no doubt. But you can't lay your hand down and show your cards. You can't be needy, you can't seek approval, you need to be an individual and be strong. I'm not totally up to date on your sitch, but if you guys aren't working on your marriage, I don't think you should be facebook friends with your WAW... Last resort is about letting go, giving space, make them come to you... If you are checking out their page, wondering what they are doing, asking questions about their life, SHE STILL HAS YOU. It's hard to want something that you have wrapped around your finger. You have to detach. A lot of people underestimate telling their walk away that they WILL NOT be friends with their ex if this is how their marriage ends, but I guarantee you this is one of the most powerful factors in getting them back.