IRC

webchat : https://irc.anarchyplanet.org/#library

or point your preferred IRC client towards the server || port (regular, SSL, and via Tor):

server: irc.anarchyplanet.org

channel: #library

irc.anarchyplanet.org || port 6667
irc.anarchyplanet.org || port 6697 (for SSL)
km3jy7nrj3e2wiju.onion || port 6667 || (and) 6697