I invested in Faceter.
It is either going to be a smashing succes - or die a quick death. I hope for the first.

One thing that got me a bit worried though, was the video of the office just before the launch of pre-sale. The office and desks were complete empty. Like it was just a set made for the filming. The only piece of hardware visible, was a camera in the development department. I have seen a lot of development departments in real life, but none as empty as this. I saw this after I had already invested, so I hope that I am dead wrong.

Well, everything has a risk and you already did it. The project may seems have a better concept and technically speaking it can be possible to have this kind of features. I am hoping you only invest of what you can afford to loose so that you will not regret in the end. Anyway, you already invested and I think I didn't see any major issue about the project. Let us just be confident that they will be success with their ICO.