All fair points and an indication to the quality of 'friends' sometimes who might or might not make the effort. One point I'll make is that being on LinkedIn, to me, as what being on Facebook is for him. I don't like LinkedIn, but I'm on it, reluctantly. I am only there for potential business and 'presence'. My "contacts" are mostly former colleagues, and recruiters. Every button click on LinkedIn requires a second thought as it might be a contact harvesting trap or worst. I really don't like it, yet I'm there because I realise that sometimes this is a viable channel for this or that purpose.