For the first time ever, Android is being used more frequently than iPhone to access Facebook.

Facebook for Android has 58.3 million average daily users compared with an average of 57.4 million daily users who access the social network via an iPhone app, according to stats complied by AppData.

The Android app, which was released in September 2009--a full year after the iPhone app--still trails the iPhone in monthly average users accessing Facebook, tallying 85.4 million users to the iPhone app's 99.1 million. However, the monthly user data doesn't reflect the "stickiness" of the daily user data, or the number of users who return on a daily basis. In that measurement, the Android app's 68.2 percent still leads over the iPhone app's 57.9 percent.

One explanation for the leadership change could be the fact that more than 550,000 devices are being activated every day--up from a daily tally of 500,000 in June and 400,000 in May. More than 200 million Android devices have now been activated around the world, Google announced last month.