There's r/linguistics, tho quality content and well-intentioned participants are limited. Y'know, general reddit things. There are some other subdiscipline specific subreddits too, tho all fairly small. This is a multireddit I made that contains the ones I know of: https://www.reddit.com/user/gkayaalp/m/linguistics/

The best community I know of is the LinguistList. I follow their RSS feeds to keep on top of what's happening in the field, but they also maintain many mailing lists, which you might wanna give a look.

There's also linguistics.stackexchange which does have some good content and answers.

There's some small linguist presence on Humanities Commons (https://hcommons.org).

LingBuzz is like an arXiV--discussion board hybrid thing.

If you're into conlanging, I know that some communities/subreddits exist but IDK the names or URLs, unfortunately.

Other than that sadly we don't have anything to the extent that CS or physics enjoy.

Edit: You're welcome, BTW. If you want to ask about anything more specific, resources or otherwise, I'd love to help.