It was just the same about 23 years ago. My cousin was raised by TV/PC screen, drunk dad and overprotective mother that would do anything to keep him quiet (screen worked the best).

He was kind of ADHD person, never confirmed by anyone, but he was jumping in place everytime something exciting was on the screen, always wanted to move around, hit other people. And most noticeable - he was furious when somebody told him to turn off tv/pc.

I've seen many not behaving kids of course, this one had uncontrolled access to technology even then.

And now we're alarmed? We had a lot of time to notice. Don't forget that TV and computer isn't something new. People were addicted to mobile phones (without internet of course, just SMS) even 10 years ago.