Growing up with Pokemon, Power Rangers and MTV instead of Mr. Rogers, Captain Kangaroo, Reading Rainbow and Sesame Street is hard for me to even imagine.
Moving on, four and five year old children now days watch violent animated cartoons with poor graphics, no plot to speak of and nothing whatsoever about the programming that would qualify as even being within the same ballpark as the word "wholesome". The stuff that by today's standards is considered wholesome is so bizarre and creepy (that's right, I'm talking about you SpongeBob, Teletubbies and especially Pokemon) I'd have to sit down and put some serious thought into whether or not I'd even allow my hypothetical child to watch such downright weird and freakish characters.
Even if we had cell phones at 13 years old the way kids do now (I got my first one at age 19 my sophomore year of college), I seriously doubt my generation would have had these issues with "sexting" and "cyber-bullying" the way kids today do. For one thing, the girls would make us "go out" with them for months before we'd even get to second base. Sex was rare, and even then usually only for the handful of the most popular students in school. I'd like to think it was because the girls back then had self-respect, but I learned that was definitely not the case once they got to college.
In my estimation, the technology itself is not to blame for the ways in which children are using/abusing it. Part of the problem is that parents are leaving it up to the schools (and to television) to instill values, morals and the explanations for why these concepts are eventually embraced by virtually all functional members of society. That is not to say teachers don't care or make no effort to teach these things. However, it is the parent's duty to teach those matters to children --- and not just the bottom line of right/wrong, acceptable/unacceptable behavior --- but also the "why" behind it.
Children are far more likely to be obedient and well-behaved if they understand why their parents want them to behave in a certain way.
The other part of the problem is that children today are growing up watching Pokemon and a host of other programs about which the term "mindless entertainment" would be far too generous a description. Twenty-five years ago, children grew up watching Mr. Rogers, Sesame St, Captain Kangaroo, the Smurfs, the Transformers, Looney Toons and other cartoons that were entertaining, had storylines and didn't make fight-to-the-death combat the focal point of the programming. Compared to what they're seeing today, I worry about how the generation of Americans that are young children now will turn out as adults given the radical shifts in the nature of children's programming combined with (in many cases) the declining role of parents in establishing moral and ethical boundaries with their children while placing extra emphasis on the explanation of "why".