I said replacement of emotion and social interaction with technology. It's the removal of the human element that troubles me. When people stop reaching out to one another, and instead reach out to a plastic widget. When instead of sharing, laughing, and crying together, we take, laugh, and cry in a room, alone, our thumbs and index fingers hurriedly punching out comments on data streams, missing vital clues and skipping over the common human courtesies we learn and use in the course of physical interaction. Facebook is stripping away our humanity.
The simplest example is the occasional comment-box-flame-war you'll see when someone posts something about race, religion, sex, politics, etc. Total strangers haranguing your friends because they decided your status update's comment box was a nice place to have a pointless argument. It's made worse by the vagueries of the internet and the invincibility of the internet.
Email and text don't work the same way, and aren't a threat to human interaction in the way Facebook is. Twitter is similar, though, which is why I also deleted Twitter.
