Facebook claims to have a user base of about 750 million. Of this, an estimated that 250 million users access Facebook via mobile devices.
It is possible to filter down this calculation to individual devices by using various Facebook Apps. Facebook has a page for every authorised app that is connected to their system. Through these dedicated Facebook pages, blogger Benedict Evans calculated how many people use each Facebook app on each mobile platform, such as the iPhone or Blackberry.
Evans estimated that smartphones from Samsung, HTC, Motorola, Sony Ericsson and LG jointly account for about 24 million users, while the official Android Facebook app accounts for about 53 million users. Android, in all, has approximately 76 million Facebook users, in spite of having sold only about 120-130 million handsets.
About 50% to 60% of users of the iPhone and iPod Touch use Facebook. Since Apple has so far sold about 190 million of these gadgets, the number of Facebook users is estimated at around 85 million.
Ovi from Nokia has only about 5.6 million users, while the recently launched Facebook feature phone already has about 7.5 million active Facebook users.
These statistics proportionally reflect the number of smartphones in the market using the main operating systems and from each major manufacturer.
However, there are some devices that do not have an official Facebook app. For instance, the iPad does not have an official Facebook app as yet. Similarly, a number of OEMs using Android have their own Facebook apps.
The number of people using the exclusive mobile website is far less than those using Facebook apps. The number of users accessing the social network via third-party apps is about half the number of people using Facebook.
In total, the number of people using all of the apps comes to about 222 million. If Facebook’s estimate of 250 million mobile users holds true, it can be estimated that about 28 million people are using the mobile web for Facebook exclusively.