I don't think it's supposed to be limited to "journalists," but then I am not a megalomaniac.
The first amendment applies only to hand operated single sheet, hand operated printing presses. It doesn't apply to fully automatic, high speed presses of today. And it certainly doesn't apply to "street sweeper" internet posts. < /applying anti-second amendment "logic" to the first amendment>
Every time someone complains about bloggers and amateur journalists, we need to shout about the effects of Buckhead and the famous post #47 which brought down "professional" journalist Dan Rather in 2004. The journalists have become a self-protecting guild and only voices from the wilderness can proclaim the truth.