Mine would have to be reddit. I've been a member there for awhile. While there are some parts of that site that are "less than appealing", I mainly just filter out those subreddits and focus on the news-related ones.
I would have to say Google and Amazon. I'm constantly googling - I love to know all the little trivia about people, places and things. And Amazon not just because of all the books and dvds but a lot of people don't know how much other stuff Amazon sells.
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Most frequently I use Tumblr. I just look at the tags and other people's blogs plus some stuff on my dash every now and then. I haven't updated my blog for a long time and I probably should get back to using it again.
The other site I use is BuzzFeed. It's definitely one of those things to help me through the day. It's just so interesting to read all the articles and the quizzes are pretty great too.