As another poster pointed out, "Freedom of Speech" is not an issue for a private web site. I offer DU as an example.
I am constantly amazed by how many do not understand the following: 1. the Bill Of Rights is an imposition of limitations on the power of the Federal Gov. over the State Govs and the common citizen, not a cudgel for one citizen to use upon another 2. your civil rights end when you set foot on private property (real or virtual).