Gitter is used for real-time chat. You can reference OpenBEL issues like OpenBEL/bel.rb#73. You can also mention one or all users in the chat which will provide them with a desktop notification.
BEL Language Questions - how to capture biology in BEL
StackExchange has the best Q&A system available with ability to show multiple potential answers and vote on the best ones
Google Groups is used for OpenBEL discussions and troubleshooting help.
Google Hangout can be used to hold face-to-face meetings.
Follow instructions on the Google Hangouts page.