The First Amendment is absolutely null and void within the confines of privately owned enterprise, such as AOL or TFL. You have every right to start your own bulletin board or ISP, and when you do so, you may censor contributions in any way you see fit. If people don't agree with it, they are free to look for a competing service that falls more in line with their beliefs and views.
Your contribution betrays a fundamental and all-too-common misunderstanding about freedom of speech. The First Amendment protects public speech, on public grounds...not publically accessible speech on private property. Do I have the right to come into your house and say anything I want, without any right on your part to tell me to shut up, change the subject, or leave the premises? This is the same deal...TFL is someone's enterprise, a virtual living room, and whoever owns it makes the rules regarding acceptable speech.