Sorry that my post came off as harsh, but DEFINITELY there are people who do things to prove that they are better parents than you.  My nephew, for instance, was 9 years old before he saw a commercial. They made the kids leave the room so they would not be so corrupted by the commercialism of the world.   Ironically, both parents are in media/marketing.  And I just got another dose today of "why we are better parents than you".  Honestly, the child was an outcast at his conservstive christian school and I just don't know how he is coping in his new school in Santa Monica.  And today I got a good healthy dose of "I am a better parent because I don't let my kids dwell in the material world"
I think what you are trying to instill in your kids is great, but it is a fine line to tread.  Too restrictive and you end up with resentment or worse, a child who is unprepared for the adult world.  For me, I ended up both.  I've tried hard to learn from my mother's mistakes while keeping the lessons intact.  Video games, television, cell phones are great tools and hobbies, but they should not be your life.  The key is to teach children to use them wisely and to find their own amusements as well.  
Denying access doesn't teach them nor does it instill the value of WHY moderation is important.
I do agree that one child at a time is easier.  Let your son pick a friend and an activity he thinks the friend will enjoy.  Your son knows them and their interests best.