Also not a lawyer (and in the UK) - I tried to dig out a loophole for example &quot;Your friend technically sent the message to you not us!&quot; sort of thing<p>But no, as a layman I can&#x27;t see how this is getting by the CAN-SPAM act. It doesn&#x27;t give you the option to not send it and sends it anonymously. From the recipient point of view it&#x27;s just a random unsolicited email. I guess it&#x27;s one of those it&#x27;s easier to ask forgiveness than permission things.<p>My guess is the moment someone with potential legal clout challenges this the invites will be changed to a &quot;Do you want to invite your friend yes&#x2F;no&quot; system