I realize that this doesn’t map to the workplace unless you’re in a position of authority, but in a FB group that I co-admin (for jewelry from a specific artist), we have the following in the rules:

This is not a women-only group.

Please use gender-neutral language when addressing the group -- we're not all women, ladies, girls, etc. Good examples are "everyone," "all," "folks," "y'all," "friends," etc.