|I have to agree with saucome. |
Myself, I kept the computer where I could actively monitor what he did online. I kept it in the living room not too far from the TV. My son was only allowed one hour of electronics per day, providing his homework an chores were done first. (ie: he had to take care of his responsibilities before he could play).
Most weekends I doubled his daily limit. On odd occasions when I was happy with him, I would give him more time as a surprise. When he did something bad, I grounded him from all electronics. Minimum grounding time was 2 weeks.
Being a computer geek, my son didn't dare touch the computer when he was grounded for 2 reasons.
1) I would know it in 60 seconds or less if he had - and I checked if I had to go out and leave him alone (once he was old enough to be left alone).
2) His grounding would be doubled, minimum, more if he really made me mad.
I personally wouldn't rely on electronics to babysit my child and I wouldn't rely on it to monitor his online activity either.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.