I've been concerned that sometimes on this board we border on libel. I also wondered because there is a crazy person out there that thinks he found a fossil of a dragon and has threatened my husband on more than one occasion and published on the internet (DH says they are just rocks). So I looked up libel to see if this qualifies.
It looks like as long as we are stating our "opinions" not presenting as facts, that we are okay.
Here is a link if you are interested:
http://www.wisegeek.com/what-is-libel.htm
I was taught that if you can't say anything nice about someone then don't say anything at all.