No, I was referring to what I said in my first post in this thread.
Turns out that any promises of global reach are only half truths as it depends on how many followers you have.
Hm, it seems you have a fixed idea of things and aren't reading comments here. As I said, you can search topics on Twitter, such as "CSS", and see at a glance all the tings being said about CSS (whether via hash tags or not). You can reply to those tweets if you like. I've had some really nice conversations by doing that. And you don't need a single follower to do that.
I often can't adequately say what I want within 160 characters. Its just too short.
Yes, it's certainly not a blogging platform. But if you've written a blog post, tweeting about it is a nice way of getting it out there—especially if you drop a few keywords in the tweet. Sure, it may not get much or any response, but you never know.