You actually trust the browser less than the individual apps developed by different companies? I'd think the apps would have more security holes than a browser that's been tested and used by millions of people everyday.
It's strategic for both parties. Google wants to get Facebook users onto their own network and Zynga needs to reduce their sole dependence on Facebook.
8 for me. It's a very good sci-fi/fantasy movie, but I was probably more impressed with the CGI than immersed in the story. Star Trek was a better movie in terms of story and I actually felt fear, suspense and other emotions while watching it.
But you could quickly recover by hosting those JS files yourself and relinking them.
If your app is coupled tightly with AppEngine APIs, then there is nowhere else you can host your app.
This is worse than the 8-hr outage of S3 sometime ago... most apps could still respond without S3 static assets. If your entire app is hosted on AppEngine, you're screwed for 4 hrs and counting...