Social media and how she conducted herself on it was always an issue in our marriage and she acted like a child.
This is the exact reason I've avoided social media on a personal level (use Linkedin professionally). It was very apparent early on (when facebook first became popular) that social media was going to be an issue for my dBPD ex-wife. I made a decision at that point that I wanted no part of it. If friends/family needed me, they could call, email, or knock on my door. Since the end of our relationship, it has had the added benefit of eliminating potential sources of contact in advance.
With regards to your situation, be strong and fight the urge to look. Good luck.