Thanks for posting this, I had read part of those tutorials a few weeks back and they were really great at explaining the logic, but I couldn't find them again when I wanted to show them to a colleague.
The relatedness is very much up for debate though. If i like an article on a website, then later on that website publishes something else which is only related because its on the same site, does that mean facebook can re-use my like for the new page?
Not only would i need to vet all the current content to see if there is something that i don't agree with, i would need to trust they would not post something horrible in future and have my name attached to it under a related post.
I'm pretty sure selling something you don't actually have isn't allowed on ebay (he's selling a phone he hasn't received, and in all likelyhood wont receive as google could quite easily cancel the other 2 orders as they seem to be a mistake).
Having just finished writing a phonegap app (or Cordova as it is now known), this makes me much less likely to want to use BB10. I've only used Cordova on ios and android (simply because blackberry has such as small percentage of the target it is not worth the investment).
Native apps are much nicer and easier to code, regardless of the platform. And don't even get me started on the mess that is trying to use JS frameworks such as Jquery mobile to actually do something useful. Such as facebook or twitter integration.
Cross platform app development is a good ideal but none of the current platforms can do it in a way that isn't a horrendous pain.