I just did a Twitter search for “China Protests.” I saw plenty of good video reports on the protests and didn’t see any porn. Perhaps Twitter’s porn-removal algorithms finally kicked in.
It may be that the search algorithms are based on habits of the user. If you usually look up porn on the internet, then the Twitter search results for “China” try to give you your results. But if avoid porn on the net, then maybe you get cleaner search results.
I don’t get porn either, and I don’t view it.