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/r/crappydesign
Oh wait, this isn't the Reddit anymore.
Did I do that right?
Exclamation mark denotes the community, so:
The @ is the username indicator, so you've pinged people whose usernames are those for the instance.
This is one of those double edged sword things with Lemmy, since there's so many places a community can be, they all end up being a little smaller. There's got to be a better solution for that. Maybe when creating a community there should be a way to automatically search a large portion of committed all at once and display it to the user.
What's needed is the ability to create and share 'meta' communities. A group of smaller communities can then loosely appear as a single larger community. Users can still drill down to the individual sub comunities, if they choose to. A little bit like a recursive federation.