The Internet Is Actually Good
I grew up from the age of 8 online (I'm young for this demographic, I know) and I'd like to say spending 5 hours a day on a computer made me who I am. That is, ambitious, albeit disconnected, but friendly. I hope.
The more sources of conversation or social interaction you have the better your own will be. I can write well because I've read lots of books from a young age. I can converse, online or in person, because I've spent a lot of time reading other people's conversations. Social aspects of the internet are engaging, possibly addicting, but only harmful if you lack restraint in ways that would affect you even if you didn't have the internet. It's a booster to whatever negative or positive traits you already have. If you're insecure it'll make you moreso, if you're ambitious or creative it'll make you more so.
As for tablet/mobile games being used to pacify kids? I do think it's not good if they're in public. If they're at home, they can do what they want, but parents should make sure they're aware of how many hours and if it reaches whatever amount they personally think is right, take the games away and try doing something together with their kids.
Technology is irreversibly a part of child rearing now. You can't bring someone up the amish way without sheltering them and exposing them to humiliation throughout all of their <18 life as they lag behind culturally. However, as with eating puddings, or cola, or any other questionable-but-unavoidable stimulus, you have to restrain it while they don't have the power to themselves. As a parent you take care of them until they can built up enough mental fortitude to disobey everything in uni and figure out you're actually right without it affecting them psychologically.