There are plenty of sites around where you can trash someone anonymously if that's your thing, but this is not one of them.
It is acceptable to post factual accounts of disagreements (e.g., "My name is John Doe. I worked for XYZ, Inc. They said I'd get paid in 30 days but I still haven't seen a dime after 3 months. I'd advise anyone not to work for them.") but it is NOT acceptable to post accusations ("XYZ, Inc. doesn't pay their contractors and if you work for them you'll get screwed.") Please note that any remark claimed factual but posted under an anonymous (non-Privileged) account or without the author's name clearly displayed is still subject to removal at the discretion of site moderators. The balance between informing the community about bad actors and protecting the rights of innocent parties is difficult to maintain. Please be understanding and take care when wording your messages.