In my personal life I am much the same. I use a handful of forums and messageboards (of which this one is by far the most prominent) and browse news sites like the BBC and Guardian on a daily basis. And I use a few favourite retailers for buying comics, books, games etc. Other than that, not many other regular favourites.
I am on Facebook and Twitter but very rarely use them - only if I need to contact someone and have no other way of doing so.
For work it’s very different - I have to do a lot of trawling through online resources on a daily basis, with a huge number of sources that require regular checking, and lots of research done online.
Part of that involves reading stuff on Twitter, although I don’t tweet stuff out myself. The side of it I see is mostly the self-promotion/PR side, which can be a bit relentless and tedious - although I know that people use it in a forum-style public discussion kind of way (which sounds more rewarding).