Scott Howard wrote:
Have you actually confirmed it's NOT opt-in? The screenshots on the Linked-in engineering blog referenced earlier certainly make it look like it is.
http://engineering.linkedin.com/sites/default/files/intro_installer_0.png
Of course, you could argue there's a difference between opting-in for "enhancing your email with Intro" and opting-in for "Please MITM all of my email and dynamic modify it", but that's really just semantics - it definitely appears to be opt-in.
There's consent and then there's informed consent. Unless they explicitly disclaim that "WE CAN AND DO READ EVERY PIECE OF MAIL YOU SEND AND RECEIVE AND USE IT FOR WHATEVER WE WANT" then it isn't informed consent. My guess is that the confirmation dialogs are more along the lines of "DO YOU LIKE CUTE KITTENS?" Mike