Comment by mindcrime

http://lobste.rs

http://barnacl.es

http://slashdot.org (most days)

http://dilbert.com (most of the time)

Reddit (http://reddit.com/r/machinelearning, http://reddit.com/r/artificial, http://reddit.com/r/semanticweb, etc.)

http://arxiv.org/corr

http://www.jmlr.org (maybe not every day, but close)

http://www.jair.org (maybe not every day, but close)

http://news.google.com

http://www.youtube.com - for music and for various tech videos

http://www.coursera.org - I'm working my way through a couple of Coursera Specializations, so I'm on there pretty much every day.

http://www.phins.com/phins-urls.html - to catch up on the latest Miami Dolphins news

I think that covers most of them. I'll check http://theregister.co.uk quite often as well. Oh, and the main social networks too... FB, Twitter, G+