We hate to be the ones to tell you, but poking your girlfriend on Facebook (does anyone poke anymore?) isn't the same as actually hanging out with her. Connie discovers this to her dismay when she realizes that Clifford's company isn't actually a substitute for real human interaction. Everyone in Lady Chatterley's Lover is alone, some by accident (Connie) and some by choice (Mellors). The central couple is supposed to be a model of how to find human connection in an inhuman age—not through jazz dancing or Foursquare, but real, human sex.
The modern world's emphasis on intellect and progress has made true connection impossible, because true connection can only happen in bed.
Isolation destroys human nature by perverting people's social instincts.