I'm wondering which other avenues for bitcoin discussion exist and how active they are. By volume bitcointalk and reddit are huge. hackernews features bitcoin news regularly.
Adam Back lists the following mailing lists. also see this part of interesting history:
https://bitcointalk.org/index.php?topic=225463.0 The cypherpunks mailing list
The cryptography moderated crypto mailing list (mostly low social significance tech discussion) archive
The coderpunks list is dead try the cypherpunks-moderated list. (Old coderpunks archives can be found here archive)
bluesky global-scale distributed storage mailing list bluesky
The p2p-hackers list
The steganography mailing list
The ukcrypto mailing list, crypto politics in the UK
http://www.cypherspace.org/adam/