Haha, I don't use any of it, I basically drop the users and lists I follow onto a speeddial2 page it keeps up with how often I visit them and sorts them in that order for me.
Same for facebook, I never use the feed.
Hashtags as well. That would be a great feature to just be built into a platform, especially one that isn't concerned about feeding you ads and keeping up with what you like, etc.
I have done the same here for users with landing pages, however, I can't reply to them.