That was my initial thought, but I just can't see having a poll with ten choices which'll end up taking a huge estate of mobile screen space be viable. Sort of conforms to their 140-character limit justification for tweets: short and simple.
This is an invaluable resource (next to McConnell's Code Complete) that has influenced the way I program even to this day. Happy to see that my old university is still using HtDP as its curriculum's primary guidance.