Do you think that Facebook is censored?

When I write particularly red-hot racy political comment, I find that my comments disappear almost immediately. I am not friends with a huge number of people, 77 actually, and most of my friends aren't the kinds of people that would report comments. Also, the comments that go missing are not rude per se but are usually just uncomfortable truths. Do you find this, or wonder if fb wants to keep it light?