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I like reddit. I don't much like proggit as it tends to be snot-nosed kids who think reading a blog post here or there gives them some expertise, but if you can deal with the stupidity, you can still get some valuable information/insight/discussions out of proggit. To me reddit is amazing for the sheer breadth of content you can experience. I can laugh at a stupid cat gif, involve myself in a deep discussion about type theory and why monads in haskell are amazing/suck/are-kinda-ok/what have you. I'm also on HN, never could really get into slashdot (not sure why, something about the way the site looks and works turned me off of it).