I really hope he is interacting with billions of other people
out there in the net.
I think his
main activity is downloading and watch whatever he has downloaded.
Everytime I walk pass his room, he will have different programmes
playing on his monitor. Ranging from anime, to drama series, to
entertainment shows. I do agreed that since its his term break,
must give him a break. However even when his school term start,
other than going to school, he will be back to his usual routine. I
btc, never go to uni one (lol), so I have no idea what is the
workload in the uni? Does it differ from other uni? Is it 1st year
quite relax?
Btw based on my younger brother's lifestyle, is there any za bo
who want to date him? 
No leh... NUS very relaxed one lah...
Let him break lor.... Now economy not looking that good, maybe
part-time jobs also harder to find liao...
You should only start worrying if he does the same after
graduation.