Do you feel guilty after spending a lot of time on the internet, as if you have been wasting time?

After spending a night on Fluther, Facebook and other sites, i feel as if i have been wasting time. I enjoy it, and i use the internet in part to communicate with other people, but i feel as if most of my time on it is not productive. I feel as if i should have been catching up on reading or something, instead.

Do others feel the same way?