Not sure if something exists for this, if it does, let me know.
However, I am looking for a modification that would work similar to DBtech's Advanced User Tagging but instead of tagging a user, it would tag a "group" where people can choose to be added to the group. This could be used for both messaging in the PM system as well as tagging on forums.
ie: @group_mancityfans or @markfl_fans (

)
I would envision this as something that a user can create a group and either add members to it (more admin/moderator functionality) or people could "subscribe" to that group.
I am not sure if this could even be possible because it would not be calling a user per say.
and as a point of note, I already asked for this on DBtech with no answer
Thanks,
Scott