There was a huge hype around Twitter data one or two years back. Then it was followed by suspicion and criticism Now we should take a more balanced view. Twitter data or social media data aren't all-powerful, but I believe that if we look at it from the right perspectives, we still could learn something meaningful, despite its demographic bias. But certainly we have to be very cautious about any conclusion we draw. This is still a work in progress and we'll try to extract unbiased information from the biased source.