Seriously, drop your email address here, or email me directly if you'd prefer, and I can invite you.
http://techmeme.com http://techmeme.com/river
http://mediagazer.com http://mediagazer.com/river
http://redef.com/channel/media http://redef.com/channel/tech/feed http://redef.com/charts/popular/total http://redef.com/charts/shared/total
http://readability.com/topreads
http://thewirecutter.com http://thesweethome.com
and for everything else there's http://www.usepanda.com
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and ones I never seem to make it to
http://www.isitfunnytoday.com/
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and if I were limiting myself to non aggregators: atlantic, newyorker, bloomberg, avclub, indiewire, arstechnica, mit technology review, techcrunch, anandtech, nautilus, npr, rolling stone, wsj, nyt, guardian, wired, vice, foreign policy, the kernel, stratechery, harvard business review, variety, birth movies death, priceonomics, poynter, digiday
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+