1. Push notifications. Unless you were constantly checking the website, how would you know whether someone is running a poll? If it's something like "what sort

1. Push notifications. Unless you were constantly checking the website, how would you know whether someone is running a poll? If it's something like "what sort of food should I eat?" I doubt the poll is open for very long. 2. Payments. Being integrated into the in-app purchase system is a much faster and smoother experience than asking for a credit card number. And some people are not going to want to enter their credit card number into a random website to vote in a poll.