Doesn't seem reasonable to me at all. If you do not wish someone to visit your public website, you have to close it to them e.g. by revoking their login credent

Doesn't seem reasonable to me at all. If you do not wish someone to visit your public website, you have to close it to them e.g. by revoking their login credentials or blocking their IP address. Or, don't make your page public---there are plenty of technologies to connect people that do not involve public web pages. We can also look at it the other way round. Let's check whether Facebook will be convicted of a violation of the Computer Fraud and Abuse Act if they continue to track any data related to a person (e.g. obtained from embedded Like buttons or images uploaded by FB users) after that person has send them a cease & desist letter...