Of course there are rules. They don't have to be laws made by the government to be rules. I wouldn't walk up to a stranger and say 'you smell'. Why, because its RUDE. I am protected by free speech to be able to do so, but, that doesn't mean it is OK.

Its a good idea ONLY if it is mutually agreed upon. Would you be ok with me coming onto your facebook announcing I was going to be in FL for the dog show circuit and to give me a call if they wanted candids? OF COURSE NOT. I wouldn't do it because a) its incredibly unethical and b) its beyond rude.

This is not rocket science. This shouldn't NEED teaching, but, it obviously does.

Unfortunately there are some forums out there promoting this as a great way to market.