chowderhead - you stated - "You can discuss the principals of a public company and call them dirty rotten scoundrels in public because they lead their professional lives in public."
Yes and no. You can't liable or slander them. There are laws for everything and first-amendment priveleges don't extend in some cases.
In a case where an electronics firm argued an America Online subscriber was libeling it, and where AOL relied on Hustler Magazine v. Falwell to defend its user's First Amendment rights, the Virginia Supreme Court ruled that AOL must reveal the member's identity.
Responding to an Internet posting about it, Hong Kong-based Nam Tai Electronics Inc. sued various unnamed parties in a California court alleging libel and violations of California unfair business practices law. Among the postings, which appeared on a Yahoo! investment site, were some by an entity using the screen name "scovey2."
In one message, titled "Sinking Again," scovey2 said, "Sinking is not a province in China but an observation of this company's stock market performance. This low tech crap that they produce is in an extremely competitive and low profitability industry. I see see-sawing of the stock with no real direction. (See-sawing is also not a province.)"
Description Virginia high court held that under rules of comity, a Virginia Internet service provider must submit to a deposition to provide information for use in litigation in California that involves an unidentified subscriber accused of defamation.