Tor should NOT be on here. It has little to do with "breaking" PRISM. PRISM is a voluntary program wherein a handful of endpoints have chosen to submit copies of their database to the NSA. Regardless of the mechanism or browser used to access Facebook, the reality is that all of that data gets uploaded to the NSA anyway, so who cares? People aren't interested in the real solution to PRISM, which is "Don't use service…
As a fairly boring non-dissident who's just trying to be a good citizen on the internet, I think I actually consider that to be a feature.