luceos Member tagging and group tagging don't work the same way. We don't necessarily have to include group tags. What do you think?
Think about Twitter β in fact, Flarum's member and group tagging system is quite similar.
The @ symbol is used for mentioning members, while the # symbol is used for groups/tags.
When we look at Twitter, hovering over member mentions shows a hovercard, whereas hashtags don't have that.