I'm not sure I understand the argument over social media. However, I think you need to stay away from always "stressing" to her that you are not comfortable with OM having access (or whatever it was). I don't think she is going to stop it. You have expressed your feelings about this several times and she chooses to not do what you've asked. So.........why continue doing what doesn't work?
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!
