IRC (Internet Relay Chat) is one of the ways we communicate at the space. It has mostly been superceded by Telegram, which is likely to be a better bet for a quick answer.
Our IRC channel is
#hacman on Freenode.
There is a web front-end to Freenode at https://webchat.freenode.net/.
There are a great number of client programs for your computer or phone. XChat (http://xchat.org/) is a good basic graphical client. Irssi (http://www.irssi.org/) is a good one if you like using console-mode programs.
There won't always be people around to answer questions in #hacman - you may need to hang around for a while before someone answers. If you can't wait for an answer, send it to the Mailing list or to Telegram.