Twitter feeds worth following

Last week I mentioned that I've come to rely on Twitter more and more, while simultaneously cutting down my consumption of blog posts. In response, a reader asked me to suggest some Twitter handles that are worth following.

To be clear, these are not necessarily reviews or endorsements of the underlying blogs or bloggers behind these feeds; just Twitter feeds I happen to follow, and why.

To be clear, these aren't all the Twitter handles I follow, which you can find here. But they are the folks that I consider part of any well-rounded travel hacking diet, for the reasons explained above.

Are there any I'm missing? Let me know in the comments.