[MBCook]

I know that was the original idea, but I wonder how many people in the last year or two receive tweets via SMS. If I was in charge, it's a tradeoff I'd be willing to make.

[logic]

The entire world is not the United States. :) "Feature" phones and spotty data service are still very common in certain regions, but SMS works almost anywhere with cell infrastructure (or via sat phones).

[unobfuscate]

But then how useful are URL's in an SMS? I would trade off a slight decrease in usability for dumbphones for increased legibility for PC/smartphones.