Well it allows you to test your theories of what is important to people, (and maybe how you judge them based on sex, race, nationality) to what people actually say.
For start-ups, it would be nice to be able to parse all of the things people want to do, and see if you could make that happen. If the site had enough answers (lets say if everyone on facebook did this, so say 400 million) and you could parse all the info to classify it into discrete groups, then maybe you'd find that 15 million people want to ride an elephant in the antarctic before they die. It could uncover some interesting business ideas.
And for the more technically inclined you could take the images and text as a training set for AI handwriting recognition, with the added help that each piece of handwriting starts with the same words. Or face-recog to match sex, race, age, then read the words and come up with some generalizations of who wants what.
All in all, I think there is plenty of material which can make this gratify your intellectual curiosity. Depends if you want to look for it, or want to be spoon fed it.
