In the ocean of the social networking services, especially among dekstop-based users, Facebook is quite popular. And that also goes for mobile users.

It’s reported that Facebook for iPhone is the service’s most popular application.

Facebook have revealed that, out of its 4 million daily mobile users, their Facebook for iPhone mobile client sees approximately 1.64 million daily active users, compared to the Facebook for Blackberry app which has has approximately 1.56 million daily users. The app itself for desktops is one of the most popular sites on the web, so this is no shock.

Debuting in the App Store in July of last year, Facebook for iPhone client could access to more technology than Facebook iPhone websites. With the native application, for example, you can take photos and upload them instantly to your Mobile Uploads album on Facebook.

Facebook for iPhone works with the original iPhone, iPod Touch, and iPhone 3G.