The SignWriting mail list is an excellent way to join the SignWriting community.
The mail list (named "SW-L") works wholly through email. It lets you communicate with other members of the mail list, and learn about the SignWriting topics that other list members are discussing.
To join the mail list:
The mail list also has an archive which contains over ten years of mail list discussions on the topic of SignWriting. The archive is fully searchable, and a valuable resource for learning more about SignWriting.