That said,
1. Business is cut throat. It's helpful for people in business to be cut throat, it helps them to survive and move up the org structure. They also get budgets and climb the ladder through increasing headcount below them.
2. This SVP didn't have you reporting to them, it sounds like you were putting their role at risk. It appears you didn't coordinate PR campaigns and didn't get approval for every statement (how else were your posts flagged, if you didn't post without prior approval). It could be a lack of policy which created these issues, but IMO I can see why the SVP responded the way they did. You can call it bullying if you'd like, but that's life and the way it works.
3. Even with point 1 and 2, something seems off. No one thought it was weird your posts were being flagged? No one backed you up? This new SVP just moved in and removed you with no comment? Why? People don't act hostile for no reason. Did the SVP just view you as a threat? Seems like something is missing.
Finally, I definitely would have personally handled it by just speaking with you or working through it. I've worked a lot with public relations teams and never would have thought they'd lash out at their public face (seems like a bad policy...).
I used the term "flagged" which was described in the article. I assumed it means that "this SVP was sharing them with your boss and saying -- this is bad" or something.
Who was this SVP? Why did he setup the social media council? What was his job function?
I am curious, do you still do social media just as much on the side, or is it your main job now? And do you look back at your days then and think you were tweeting too hard?