He texts his friends because he doesn't want to walk.
He checks his facebook/twitter and etc because he can't stay away from the internet.
He checks his grades via the internet because he's too lazy to walk to his school.
Who the hell are you to dictate his life and what he is and isn't lazy for? Say he lives in New York. What if his loving school is in Manhattan and he lives in Queens? Facebook and Twitter is your most valid argument, or, rather your least invalid argument. Social networks such as Facebook and Twitter aren't just for social stuff and once you start using them, you can't just stop. It'd be like saying "okay, I'm going to stop using cars right now". It'd still work, but barely and way loving less efficiently than it was before.
Like today, I got a Facebook message from my manager at work saying that I need to get work permits ASAP for my new job. I was in the middle of school, so he couldn't call me and he didn't know my email but we were friends on Facebook. Done.
Finally, who the forget walks to talk to their friends? My closest (geographically) friend lives two miles away. And again, sometimes there's pressing stuff that needs to be discussed. I have a friend that lives 15 miles away and he had a really stuffty day so I called him up and we talked for a while.
On a side note, I also think it's so funny how you're so damn close minded to any concern or mindset or need but your own at the age of 12 that you say "walk" instead of "drive", even though Bones is 20.