the accomplishment from an engineering viewpoint (everyone working with 3D printing materials knows what I'm talking about), there is two things that came to my mind when reading these news: 1. What makes self-made weapons made with 3D printer more dangerous than those made will e.g. a CNC machine and 2. The last thing that we need is another way to make more guns..

What potential do you see in the combination of these "opportunity" signals (Wifi etc.) that are to be used in NAVSOP and data from sensors like an air-pressure sensor, accelerometers etc.?

for Facebook Maps (only available on Facebook phones though)!!!
Because we think it's just so much better if you can look at a map together with your friends.

Cheers,
Mark

Powerful competition for Google maps will give them pressure to improve their service (the same for their competitor). That's definitely a good thing for the customer. Also the more people there are developing maps services the greater is the probability that a minimalistic version as mentioned by the original post will become available.