From Town Criers to Bloggers: How Will Journalism Survive the Internet Age?
The first amenedment is in place to prevent arbitrary restraint and censorship by all arms of the government, federal, state, local. Though the Constitution does NOT protect against consequences ("I may not like what you say, but I'll defend to the death your right to say it"), the spirit of the American republic delieberately prohibits government from penalizing or exacting payment for speech from the people. Compelling a tax is extorting money for information. This creates an economic barrier to information, and limiting ideas, information, and discourse in any way OTHER THAN FOR PUBLIC SAFETY (and even this is not an absolute) is the work of tyrants.