Can my company take my job or fire me based on somethin i pussy on facebook?

I posted a picture that said I would love to scream fucking idiots. I also stated that my company should watch out. This was reported by some people who I turned in for harassing me and verbally abusing me. I also made comments about a project manager and my supervisor. I said the project manager was a dork and that I would rather have someone else as my boss than the one I had.