You should beware that /lmg/ is full of horrible people, discussing horrible things, like most of 4chan. Reddit's r/locallama is much more agreeable. That said, the 4chan thread tends to be more up-to-date. These guys are serious about their ERP.
Reddit is censored, nerfed and full of a different sort of horrible people.
HN is a kind of small miracle in that it's the sort of place where I'm inclined to read the comments first, and seems to be populated with fairly clever people who contribute usefully but not also, at the same time, extreme bigot edgelords and/or groupthinking soy enthusiasts. (Sometimes clever folks who are still wrong, of course, but undeniably an overwhelmingly intelligent bunch.)