Basics
- Start with #, no spaces; use underscores or camel case;
- Non-Latin tags work too, such as #tips;
- Tapping a tag searches it, across chats as well.
Channel index
- Define fixed tags per topic (tips, updates, q-and-a);
- Post a pinned index message with clickable tags;
- New subscribers browse history topic by topic.
Naming
Use one spelling per topic — avoid both #tips and #howto for the same thing — and prune unused tags regularly.