A few notes on this, since First Amendment/free speech topics seem to be trending on the Boards lately:
First off, I must remind everyone that the Boards program is not Riot, mods/Heralds/etc. are not Rioters, and this post is not in any way an official legal notice from Riot nor does it apply to in-game issues as we only moderate the Boards.
Text of the First Amendment to the U.S. Constitution
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
The First Amendment is an extremely important principle which protects American citizens from legislation (and, implicitly, prosecution) by the United States Congress over their freedom of speech. It is crucial in preserving Americans' right to open, honest public debate in civic and public forums.
However, even under the First, certain kinds of speech are not protected - generally speaking, this includes violent threats, extreme pornography, and speech designed to violently or maliciously disturb the peace - the classic example of this third category being shouting "fire!" in a crowded theater.
The First also does not remove the right of private entities to determine rules within their own property which create a safe and healthy environment, including rules governing speech. And unless a state or city has superseding laws itself, all powers not expressly given to the government are reserved to the people via the Tenth Amendment.
TL:DR: The Boards program is not Congress.
We absolutely do have the right and power to moderate or censor speech which creates an unsafe environment for our players, and we will continue to do so.
We absolutely attempt to allow as much free speech and self-expression as possible, but ensuring the safety of our players comes first.