I find this incredibly hard to read.

I suspect that Facebook today has the ability to intuit the mood of a post (not to mention the fact that you can explicitly state your mood), and I think they will use this to offer a way to sympathize with the authors of posts that have a somber message or are reflective of a sad time in their life. I can't envision a general "Dislike" button that would allow you to disagree with an opinion or bully someone.

Perhaps we can think of it like a "There There" button instead of a "Dislike" button. :)

With those missing planes recently, should an airline be describing a 404 (not found) page as having "taken flight"?

Not sure this is so great.

One thing that actually really baffles me is why the gear icon presents a popover view.

I understand that once you have something in your tape, other menu items such as "Clear Tape" and "Send Tape as Email" appear, but that baffles me even more - why would that be under the gear icon?

I've always respected Mark Jardine's design work, but this just seems like bad UX to me. At the very least, if there's nothing in your tape, just tap the gear to go to Settings.

This looks great, but that blue section just looks a little off. It's too dark, I think.

I can back this up; just got a Retina and bought one of these to go with it. Looks great and a good value.