Be careful! I have been hearing about stuff like this over the last few years, there have been a lot of cases where an employee will leave a company then go to a message board and trash the company that he/she left, and gets sued by the company for damaging their reputation, even in cases where the ex-employee may be telling the truth. Law goes a lot by precedence, and the precedence is that the companies have been winning 6 to 7-figure settlements, even when people online thought they were justified and telling the truth. Don't forget that usually companies have a lot more money than you do in case the court battle rages on for years, as they mostly do.
The problem is, even if you may be revealing the truth, if you damage an individuals reputaion damages are a lot less than if you damage a company's reputation. Think a lot about what you GAIN out of doing such a thing versus the probable downside.
I have put a few links to some articles I could find about it, I have read about some others that I can't find, but all of them have come out badly for the individual that I have seen. There are some biggies that I have been trying to find, I am sure others saw them too when they happened.
Also, be even more careful if you now trade for a competitor. It takes the case in a different direction when the company can claim you are doing this because you are now a competitor.
http://www.gigalaw.com/articles/2001-all/hollander-2001-03-all.html
"Similarly, if the offender is not necessarily an employee but instead, perhaps, a competitor, other available theories include interference with business relations."
http://www-ec.njit.edu/~walshd/001215CYBERLAW.html
"The case also serves as an important reminder, experts said, that the rules of libel apply online much as they do in the world of newspapers and magazines. "
http://www.fool.com/news/foth/2000/foth000714.htm
"Anyway, in response to the news of the lawsuit, here at Fool HQ we've received a few requests for comments on "what this all means to our First Amendment rights and the future of message board discussions." If you want to learn how this affects you, here's the three word summary: Play nice, kids."
This next one says that any defamatory comments that appear here and are not removed by Elite could actually put them in jeapordy of being sued for negligence:
http://www.mbendi.co.za/werksmns/net_law/guide03.htm#UStates
"The difficulty created by defamation cases for companies such as service providers, or even companies that have a home page with a bulletin board, is that by exercising any form of responsibility or regulation of the content published on their web page or bulletin board, they risk being sued for defamation.
If, however, they could have had the ability to regulate what was published and decide to do nothing, they could also be sued for negligence for failing to maintain some form of security procedures or editing control. Until further court decisions both in South Africa and the United States are made, the position of a service provider and companies hosting bulletin boards on their web page is an invidious one.
Be aware that defamatory statements on the Internet, even in casual e-mails, could attract liability for defamation."
There are dozens and dozens of cases like this. I love to read the fun stuff that gets posted just as much as the next guy, and would love to have a ringside seat to a heavyweight bout, but I myself would not rush into saying anything at all about a company no matter how justified you may feel because defending a lawsuit is an expensive enterprise. You may have noticed in some of those articles how they say that with a court order Elite and your ISP would be required to reveal who you are for purposes of a lawsuit, so anonymity doesn't spare you.
Hope this helps your decision. If I were you I would play nice.