As far as protected speech as it relates to the Internet and American law though, I don't think I've really seen anything that has been debated quite as much, and not only that, it actually seems to have picked up considerable heat over time rather than quieting down. It first came around (at least in any way that I noticed it) with the Chris Handley case in 2008 and has become a serious point of debate online especially with younger people.
Citizen's United isn't even really about free expression IMO, and I personally don't think people are all that split on it anyways, I think it's just a case where the people and the establishment disagree. BDS I'm simply not familiar with.
It does seem that there are new mounting challenges to free expression right now, but they're relatively new and it's unclear if they will stick around yet.
