While I ain't no lawyer, (IANL) I would also like to warn anyone that any time they say something/anything in an open Internet forum, even if they use an e-mail address that is faked (or easily setup and torn down like hotmail or gmail), they may think they are anonymous, but it is pretty much trivial for an attorney to hire someone [and file a few papers in certain courts that have strong laws about slander, like those in Great Britain or some states in the USA] to find who that person really is based on the IP number and time of the web-server's computer logs. I would also bet there is an expectation [of that same attorney] that the attorney and his hired help will get paid for this work by the person making a less than flattering claim, and not by the company being slammed (who hired them).
I would also note that [at least in some states in the USA, and as long as the webpage can be read in that state, then] the companies attorneys can argue they have jurisdiction in whatever state would be more sympathetic towards the company and inconvenient to the person being accused of doing the slamming. Further, this does not require either party to operate in that state, but the attorneys each party has to pay for will be lic. to practice in that state.
I am also aware of a number of companies whose business model is running searches for corporations to see if anyone is slamming them on the Internet. if you have any questions, do a google search for "websense dot com" to see how at least one of those companies advertises the service.
About the only way to avoid these types of problems is to be in some country that does not police the laws about copyright and corporate slander the same as they do in the EU, Great Britain or the USA.
A 'for instance' would be; I would not expect someone in say Croatia to worry about slamming some company in the USA. but I would expect some attorney/barrister in the USA to file papers for someone in the USA that says "you should not do business with 'company M' " whomever 'company M' is.
"Free speech" is not an absolute freedom, in my opinion it is only slightly more real than an advertising slogan.