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Re:21 Makes Bitcoin Useful to Developers by kolinko on Wednesday May 04, 2016 @04:52AM (#11627076)
Coinbase.com, Bitmarket.net, Kraken.com to name a few exchanges.

Also, http://www.reddit.com/r/btc is a nice bitcoin community.

Re:21 Makes Bitcoin Useful to Developers by oska on Wednesday May 04, 2016 @07:53AM (#11627678)
Alternative opinion: /r/btc is full of cranks and conspiracy-theory credulists.