Micro.blog doesn’t have special support for hashtags. It doesn’t automatically link them. There’s no global search yet. While Micro.blog users can include hashtags anyway, especially if they are cross-posting to Twitter, I’ve found that the timeline is much cleaner and readable without hashtags. I’m not saying we’ll never have hashtags. But I’m not in a particular hurry to introduce native support for them. (Once a feature is added, it can’t easily be taken back.