For the record, in order for a slander or libel suit to be successful, the plaintiff must prove via preponderance of evidence:
1) The statements made were known by the defendant to be false.
2) A reasonable person may believe them to be true.
3) The defendant must have a personal reason to make the statements.
4) The plaintiff must have suffered damages or will potentially suffer damages from the actions of the plaintiff.
You can't be held liable for slander/libel if you believe you're telling the truth, if you're making up something that is obviously false (see Falwell v Flint for a well-publicized example of that one), if there is no personal gain or grudge for the statements (how National Enquirer and all the other tabloids can print whatever they want but Joan Rivers won her suit against a reporter as that reporter had a personal grudge), and you can't be held liable for damages if no damages were caused.
That's why libel and slander suits in the US are so rare. England's laws, however, make it much easier to collect damages. That's why some organizations *COUGH*SCIENTOLOGY*COUGH* love to sue in England when they know they couldn't win a case in the US.