For the most part, I'm online as soon as I get up in the morning. Weirdly, although I don't actively use it much any more, Facebook will always been the first site I check. I don't even get that many notifications, but it's just become a force of habit over the years to do so. This is closely followed by my Gmail and then Twitter. All three of these tabs will be kept open throughout the day so I can quickly be alerted to any changes.
Sometimes I'll go on PC straight away, sometimes I'll wait a few hours. It all depends on if I've got anything big on in my morning and what mood I'm in, to be honest. Usual moddy-stuff happens first, then a bit of a posting binge, then a general lurk for the rest of the day (in case I need to do more moddy stuff later on/a spambot comes etc.)
After that - or, sometimes, concurrently - I'll go on my entertainment websites. HitFix, The AV Club etc. And maybe the BBC website to check some news and current affairs and whatnot. At this point, I'll probably watch some TV; I watch most of my TV online and there's rarely a day where there's nothing to catch-up on.
The rest of the day is mainly made up of checking back on the websites I've mentioned earlier, as well as general browsing. As the day goes on, my activity becomes more sporadic, as real life interrupts the flow of the internet. Which is a good thing, of course, as too much internet is definitely a bad thing for me! :D