This may be the biggest reason I *won't* use LinkedIn. They have no intention of controlling their spam problem. Heck, they refuse to recognize that it *is* spam. If I had an account, I might be marginally more understanding ("existing business relationship" and all). But I don't, and not only do I get these invitations, they keep hounding me ("did you forget?"). Not only is there no real way to opt out, I shouldn't have to opt out in the first place. Effectively I have, however: I block them at the server.