@thor
The sad part is, there is a context where suggesting tags is not a bad thing. But it's not in microblogging, and it's not in a way to have it right in your face as you're typing. I think it's a feature in Wordpress and I seem to remember early YouTube had it. Haven't played around with either of these 2 recently, so not sure how they work now.
But that's the part you fail to understand, how big of a difference is between suggesting # after the "creative" process of writing your post, in a segregated text box somewhere, hidden from view for most of the time; and having it front and center, all the time, pestering you on how you need to write your post.
That shit is ripe for manipulation and steering the behavior of users.