My default position now is at my computer. If I have no plans and I'm stuck at home, I'll be online finding things to do. Tonight there has been nothing for me to do. There are webcomics I check, people I subscribe to on youtube, games I play (mafia, expert 11, etc), facebook and twitter. There are websites I will visit every day (such as this one) and hope for updates.
Tonight is a slow night. My internet checks are all done and there's no one in my msn list. I usually have one friend on msn who shares my sleeping pattern and uneventful life and we'll play games or chat and pass the time but he's not been on tonight :p
For me it's not about being addicted to the internet. It's just another form of social interaction for me. If there's something going on in the real world, I'd be doing that. I'd never pass up going out with friends purely to sit on the internet. Before the internet people were at home watching TV. We can't be active every day.
I don't have too much time for myself when it's a workday so the internet is the perfect thing to stop me from going insane with boredom. On my days off I will use it to watch tv or films, find new music, play games, etc. I could probably go without it but I have nothing to replace it with. I'm not putting anything off to be on the internet instead... so I guess it's perfect for me
Day off tomorrow and I'll probably go to the cinema with a friend, or we'll just hang out here. Then I'm off to see The Drums in Shephards Bush... then it's back to 5/6 days of 'wake up - internet - workworkworkwork - internet - sleep'