Hi there easysocial, this issue keeps on bugging me and did try to fix it internally but to have no luck.
As a user/normal user we usually saw a new hashtag (#hashtag) in frontpage (just like your demo) but when clicked it doesn't do anything (just redirect you back to homepage).
One good example is
http://demo.stackideas.com/hashtag/17-joomla. What I'm saying is, is there a possible way to make that page public? If yes, how? Did try adding some codes of my own but didn't get any luck. I managed to create my own hashtag finder and trending hashes but this seems to be a roadblock for me (and my future users).