Most are annoying. They take up profile space, and they require too much interaction to be fun.
mp3.com’s Music Vote application is a successful app because it’s easy to use, it’s updated daily, and it doesn’t intrude on one’s Facebook experience.
CNET’s , , and have put together a simple yet reliable Facebook application that both exposes their brand, and engages their users. It’s just a music poll, but it’s updated every day.
After you vote, you can view the results of the general population, or the preferences of your friends who have also added the app. Congratulations to these guys for building something that I look forward to checking each day.