Dude - Good Initiative. I am from the developing world. Smart choices- via sat.

Need to think about- 1. whose gonna pay for these devices? If the cost of device exceeds 50$ an year, it has no market - at least via free markets. Tie ups with govts are likely.

2. What's the interface? People in developing countries are illiterate- They can't read their mother tounge too. Forget about English. So the tweets have to be voice based.

I have personally been interested in a device for illiterate people (more than 1 bill of them in the world - my guesstimate). It has to be only images that are very intuitive. There are ATM machines that are made for the illiterate, maybe you can learn something from their design.

Good luck man.