Both the Facebook for Android and Facebook for iPhone Apps are developed internally by Facebook. The Android app which was launched in September 2009 more than a year after its iPhone counterpart has been trying to match up to the popularity of iPhone App.

But this week the Android app pulled away with 58.3 million DAU compared to the iPhone app’s 57.4 million for the first time, according to the AppData tracking service.

Daily active users, or DAUs, relates to how many individuals open up an app on a daily basis.

However Facebook for iPhone leads in its (Monthly active user) MAU count at 99.5 million users versus Facebook for Android's 86.1 million.

Android’s stickiness is 68.2%, compared to iPhone’s 57.9%. The relationship between MAU and DAU is often referred to as an app's "stickiness."

This could indicate that Android devices appeal to a younger, more Facebook-engaged audience, or to more hardcore technology users in general. The iPhone’s role as a popular gadget and status symbol may be drawing less engaged users.

Also Facebook for Android 1.8.1′s ability to access Timeline before releasing it for iPhone 4.1 on on December 18th can help the app grow its lead.

For years, features were first released for the iPhone devices, possibly because of its popularity and its higher user count.  The Android app now stands a chance to become significantly more popular with the release of these counts. Don’t be surprised if Timeline is the first of many features it gets early.