It's an entirely different and disconnected form of socialization. Creates a lot of isolation and distance, even from the people you are around every day, like in middle school or high school.
Around 1998, I was 12/13, and I had little 7th grade girlfriends, a lot of that was just looks, I didn't have a lot of game or even confidence, or extroversion at that age. Still am pretty reserved in a lot of social situations but it's something I can turn on whenever I want. It wasn't like a walked up to them and said some smooth shyt, and then we were "going out". But I did talk to girls, that was NORMAL back then. Girls you had class with hooked you up with their friends. You said whats up with Tiffany? They said ohh she thinks you are fine. We walked the mall, we walked Six Flags. We on dates to the movies. I had girls come up to me, and I'd just be about as smooth as a 7th grader could be, which is not that smooth, but it's interaction.
These kids are socialized to resent and mistrust each other through social media, before they have even kissed a girl, kissed a guy. It's something that should be addressed by all politicians and all levels of government.