Libel
What none of you have considered is the legal definition of libel. See http://www.nolo.com/definition.cfm/term/7613C25C-8E5D-47A5-9E0D93B952DE16E7.
Contrary to popular (and uneducated) opinion, freedom of speech is NOT a license to say whatever you want about whomever you want whenever you want. People and companies are responsible for the voracity of potentially damaging statements that they make.