An Open Question on Steemit Tags

I see the two different styles of tags here in steemit. The tags that you can put in the tags field and also @tags and #tags. When I tag a group with the "#" it links the group to my post, similarly when I tag using the "@", it links the user profile in my post.

Question is, do these groups or users get notified that they were tagged?

Using the "#" to tag a group, does not show the post on their feed, so I am curios.

Any input from the community?