This outfit put me in touch with a stream of people most of whom I either know already or have no wish to get to know. The bulk of the latter apparently comprises self-regarding "professionals" with hilariously grandiose - and opaque - job descriptions that I simply don't understand. Worst of all, although I've unsubscribed, LinkedIn continues to pester me with unwanted emails. I can't stop them doing this as, having unsubscribed, I can no longer contact them in order to tell them leave me alone. Don't join. It's like the Foreign Legion. They'll never let you leave!