The first amendment states, “Congress shall make no law… 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.”
As such, Congress cannot make a law telling you that you can’t say something (with some notable exceptions, such as libel). The first amendment doesn’t refer to private individuals or businesses (such as Internet providers, or your employer) telling you you can’t say something, or censoring what you read (or giving preferential treatment to high bidders, which is one of the more important issues when debating net neutrality).
If Congress is your Internet provider, though, you might have a case.