My guess would be that it's just to hurt you. ... .
Yes, you're FB might be deactivated, but she's hoping that it will somehow get back to you. ... .
She also posted a picture wearing the promise ring she had given me, and that I had taken off when we were "figuring things out". They're cruel.
All of these things ring true. And I know that, at least in my ex's case, reaching out to hurt me was also how she would try to draw me back in. It's twisted and cruel, but also makes some sense when you think that they often deal with conflicting emotions in childish ways. My ex would lash out to hurt us, so that I would step in and fix things, and thus show that I care. She would act out in other ways too -- one time she went WAY over the line in sexual innuendo with her best friend's husband and I stomped on her foot, hoping she would get the point without making a scene in front of the whole group that was there. Later she kept telling me how much she "loved it" that I would literally put my foot down and keep her in line, and she said she spoke with her best friend and that I "was right" that the sexual innuendo always upset her. No kidding.
When we reach our respective breaking points and realise that we just cannot deal with this kind of hurtful dynamic (which typically seems to escalate -- I know my ex kept "upping the ante" to keep the drama going, meaning for instance that she went from inappropriate flirtation to sleeping with other guys), then it's up to us to step away.
My ex knew me inside and out and so she always knew how to hit below the belt to make me really hurt. It's so painful and sad to have someone you love treat you that way. I feel for you, Orange. It leaves a very bitter taste in your mouth, I know ... .