YouVersion, a free Bible app for smartphones and tablets, is tracking the Christmas story worldwide this season.

If you are one of the 72 million app users, chances are you might feel compelled to read about the birth of Jesus sometime during the holiday on your mobile device.

When you do, YouVersion will add you to a running tally of worldwide users. With each click, a star lights up on the site's world map and the ticker increases.

The throng of Christmas-inspired readers can be followed at YouVersion's Christmas Story Tracker.

Even in closed countries like China, YouVersion is available through YouVersion4China.

In addition to tracking the Christmas story, Christians in China can also create Bible reading social-networks. Users can track reading journals and share reflections with Chinese Christians worldwide, making it the ultimate digital evangelism tool.

"We're literally reading the Bible like never before anytime and anywhere with millions of new people starting every month," said LifeChurch.tv Pastor Bobby Gruenewald, 36, the app's creator.

Gruenewald estimated his company registers tens of thousands of readings of the Bible's Christmas story every day.

Why is YouVersion tracking the Christmas story readings around the world? Click play for Pastor Gruenewald's answer.