I agree with the other posters on waiting to see how you feel. The anger at how unfair this entire situation is wants to take over, but we are strong enough to resist. You are connecting the social medial situation with the the storage and now wanting to punish her for not keeping her word. I understand, its frustrating but you have to choose the person you want to be regardless of the way she acts.
As you said before it wouldn't be in your nature to do this and you consider someones word as gold. If you did tell her she could store the things there as a favor then what she does with social media would have no bearing on your word.
I get the urge to see the consequences happen also but I don't think its a good idea to try and force them. My W is now living alone and free to have friends over, doesn't have the kids as often and just got a nice raise at work making more than she ever has in her life. All things considered shes better off and doesn't have that many consequence to deal with. The consequences she will deal with are the longer term ones that could have more of an impact on her. Being petty and making her move her belongings might make things hard for her right now, but it also puts the focus back on us as the enemy. Allowing her to move out and eventually face the reality of the issues shes caused the children and having no way to blame her issues on me anymore could be the consequences that make or break this. Its just not something that will be in the short term.
The only consequences that will matter are the ones she brings on herself so don't give her a reasonable reason to blame you. To clarify, I'm not saying to ignore the storage items, I'm just saying don't do it because of her actions on an unrelated matter.
Accept what is, let go of what was, and have faith in what will be
