Those familiar with Subeta will know what this is.

I'd love to see group tagging introduced here. Instead of an @ symbol it would be like a hash tag (#).

For instance, if there were a group called harrypotter (#harrypotter) and I wanted to post a funny HP gif or something I could say "hey guys I found this awesome gif it's so funny LOLOL #harrypotter"
And everyone in the Harry potter group would be tagged.

It would solve the issue some people have with mass tagging as well, there could be a group like #masstag and anyone who wanted to be informed of announcements and shit could just join the group. Or even a #mod group so if a topic needed to be moved or something I could say "can a mod move this? #mods"

Just an idea. It can be used in a lot of different ways both informative and for fun.