Technology has the power to change our lives, not who we are. The savage brilliance of Black Mirror lies in the way its protagonists are no different from any of us: venal, coarse, hopeful, bored, romantic, and above all, scared. The very best episodes (“The Entire History of You,” “Be Right Back”) are the least cynical; they’re simply unflinching in their depiction of how the world is evolving at a far greater pace than we are. We’re not wrong to like, fave, tweet, and ‘gram. The impulse is entirely natural, even if the tools are anything but.