Slack - Easy to use great way to connect

I use Slack in an organization I am a part of. We have committees, sub-committees, and a general board, amongst other different groupings of volunteers which all need to communicate amongst themselves independently and as well as on an all-inclusive level. We use Slack in the planning of large conventions, but find it so helpful and useful during the commission of these large-scale conventions and all the events and meetings that take place during the conference. This allows for us to communicate with several people without asking them to disclose their personal phone number but while still allowing them quick and easy access to this communication from their cell phones.