More than 1 million Facebook users have participated in testing the social network's Android App. This was according to Christian Legnitto, Facebook's manager of mobile release engineering.

The users who signed up tested the early versions of Facebook's app before its public release. More than one million signed up for the beta testers program while 50, 000 signed up for the alpha program. The apps featured were from over 50 device manufacturers.

The tested apps were not yet polished. But users were allowed to give their feedbacks and criticisms within the app. This gave the company information on what to improve.

The Android alpha-testing program was started in October and was meant for Android app. According to Legnitto, it has the latest code "hot off the presses every night." It has rougher versions of Android apps than those offered in the beta-testing program.

"Because we are continually testing and experimenting on alpha, the Facebook for android app that alpha users test will look and behave differently than what ultimately gets shipped in a general release," Facebook said through its blog post.

The blog post added the users are in 150 different countries. The program's goal is to ensure that the apps for release are stable.

Facebook's program includes ways for faster app testing, real-time crash reports generation and Chat Heads messaging feature.

"We're really excited to solve these hard problems and give it to the community, as well as benefit from when the community takes these things and use them to do really interesting things," Legnitto said on a report by CNET.