How many of haven’t received unwanted LinkedIn invites from people that claim to know you, been colleagues and you haven’t even heard of?
Like… so :
or like so :
Don’t be fooled, they’re just trying to get their recruitment bonus. The right choice? The “REPORT SPAM” button up above. Press it. They deserve it. The correct way would have been a private message but it’s more useful for the recruiters to add a new contact since they may need to contact him/her again.