BitcoinTalk

BitcoinTalk is a forum for discussion of the Bitcoin ecosystem, organized into boards for Bitcoin discussion, development and technical discussion, mining, Bitcoin technical support, project development, economy, marketplace and trading discussion, with child boards covering legal topics, press, meetups, wallet software, mining pools and hardware, speculation, goods, services, currency exchange, gambling and lending.

The Bitcoin board alone lists 2818949 posts across 105084 topics, and the marketplace board lists 13261217 posts across 389789 topics, with sign-in and registration open to guests. The Bitcoin Technical Support board lists 126232 posts across 13647 topics, and the Development and Technical Discussion board lists 363214 posts across 27178 topics.