It all depends on what you say, to whom, about what, and in what climate. Within any society censorship is really just the blunt flip-side of politeness. What people don't talk about over the tea-table will usually be censored in the realms of power.
Censorship comes in a number of flavours.
Another type of censorship is more vicious and has as its goal the suppression of any information which might undermine the ruling paradigm. A third type which seems a bit missing these days is self-censorship, sometimes known as good taste, discretion, common sense, and harmlessness. If you happen to be Celtic, Catholic, a Mason, or a Protestant you might have celebrated June 21st, the Summer Solstice, the Feast of St. John the Baptist. Then every seven years. Then the guys convinced the women who ran things that it'd be a whole lot better to just offer up an animal instead of a human and supposedly we've come a long way since then.