Pages, Bubble Safari, GifBoom, Groupon, Disqus, more on this week’s top 20 emerging Facebook apps

There were a few notable additions to our list of emerging Facebook applications by monthly active users this week. We define emerging applications as those that ended with between 100,000 and 1 million MAU in the past week.

GifBoom, a mobile app that produces animated gifs, made the list for the first time. Facebook’s developer site made the list, as did Disqus and Kindle. This week’s top apps grew from between 20,000 and 220,000 MAU, based on AppData,