Francis' account, which uses the handle "Franciscus," currently has two photos, both of the pontiff praying.
Instagram CEO Kevin Systrom commemorated the pontiff's first Instagram with one of his own, writing "Watching Pope Francis post his first photo to Instagram today was an incredible moment. @franciscus, welcome to the Instagram community! Your messages of humility, compassion and mercy will leave a lasting mark."
As CNN Money notes, Instagram is growing quickly in a number of predominantly Catholic countries, including "Mexico, France, Italy and Brazil."
Since the pope joined Twitter using the handle @pontifex, he has picked up an astonishing 8.9 million followers.