Picture, if you will, a high-tech voodoo doll of you on a server somewhere. Probably more than one server. While the makers of that reverse-engineered avatar might not be sticking literal pins into it, in “The Social Dilemma,” filmmaker Jeff Orlowski makes a fine case that in mining data from your onscreen interactions, they are constructing a predictive version of you and trying to prick your interests and put a spell on your attention in historically unprecedented ways.