@intrapreneurtrends < woohooooo love it, you can even @ mention users on this site (as long as they are users that have been created in this site, e.g. I cannot @ mention other users on wordpress.com). Here I @ mentioned myself as a test.
You can even use hashtags when you create a post as I have done below (these get created as tags that link posts with the same tag).
In both cases you get auto suggestions of users that are in the system or hashtags already used.