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Hubski obviously. Most forums have boards that have a positive vibe (well except voat...). Reddit has places, 8chan has places, heck I even used to hang out in a chatroom on Kongregate a few years back with some really cool people, albeit with the occasional troll... IRC is also great place to meet people, just have to find the right group. If you like to code, certain open source projects have a positive culture. EDIT: how could I forget the wonderful people at Simtropolis? Haven't been there in a few years... but still