This 'hanging' on various places on the internet, checking mail etc is pure poison (for getting to things you want to do that you know you want to do because you love them and know you would feel better doing them instead but still you hang on the internet). I happen to think it's poison not just for me. It *is* better than sprawling in the TV sofa, but most of it is just as time-wasting. There are simply so many things that you could do, but web interaction has you hooked.
I've had periods when I've had it bad, now I try to bunch together my online activities to do many of them, 2-3 times per week. That includes checking email, because emails can cause lengthy browsing.
Bunching together my online time is a real improvement over what I did before, for me. Recommended!