I'm certain that if LinkedIn were confronted, that they could produce a response that says they are covered by the TOS you had to agree to in order to use the site. I don't have time to spend scanning legalease. Or make use of LinkedIn. If my system is being scanned, they'll see that I'm using a legitimate licensed copy of Windows 7 on a MODERN computer. If anything is at fault, it includes web browsers that Identify themselves to web sites.