2. If you absolutely can't respond in a post, then respond in a comment. 140 character posts are very often impossible to parse. And are hard to respond to if my answer requires more than 140. That's why I don't do support on Twitter. I think it's impossible. And tweets have limited utility after they scroll off. Comments create a somewhat better record. And instead of concentrating everything on one company's servers, we can spread them around a little.