I thought it would appropriate the rate the most used application on Facebook, so here goes. SuperWall by RockYou is by far the most popular application on Facebook today. According to AppData, it has almost 16 million monthly active users. Despite shedding about 5 million active users in December-January, it still holds the top spot for overall application usage. I suspect the drop in user base will continue as the application finally matured and users are turning to something new.
The application itself is an upgraded version of the standard Facebook Wall feature. SuperWall does not actually over-ride 
your existing Facebook Wall feature. However, it does not appear where the regular wall feature is but instead appears under the Friends tab in the profile page. It includes such enhanced wall features such as video embedding, eCards, graffiti, photos and comments. Users can upload their own media or use pre-existing media that comes with the application (although I find the selections somewhat limited). Videos can be grabbed from sites like YouTube (or pretty much any other site that offers videos) and the same goes for Photos.
The meteoric rise to the most used application status came because RockYou expanded on such an integral feature of Facebook, the Wall. Although I find the features of the application somewhat mundane and dull it is miles ahead of anything similar out there right now and of course much more advanced than the standard wall feature. As I have mentioned previous, expect the popularity of the application to decrease in the next few months as more and more people get tired of the app. This could change unless the developers find a way to make it more existing.
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