Even as a fairly quiet kid in high school, my first year in college, I was pretty social, while still winding up one of the quieter ones. We had blazing fast internet (T1 per building, back when it was still rare for most to have anything but dialup).
We still partied our asses off. With people on our floor, people in the building, and we all headed out for parties all the time. Even gaming brought some of us together. This was back before Counter Strike hit its 1.0 patch, and a bunch of us played together, and then would party together.
Even today, I still go to the bar with friends, we hang out, go to the occasional party (although they are a LOT more subdued these days), and spend time with friends.
I do this while managing to spend a fair amount of time online, working, etc. So, while the internet gives us new ways to relate ("Oh, did you see that site, it's hilarious!") people are, by nature, fairly social creatures.