In Japan, Miitomo had one million users within three days of its launch, overtaking the instant messenger Line as the most downloaded free app on the Japanese App Store. In the week after its initial launch, Nintendo's shares grew by eight percent following the success of the app. In less than 24 hours after its worldwide launch on March 31, the app already had three million users globally, and also rose to the top of the U.S. App Store, overtaking Snapchat. Miitomo later had 1.6 million downloads within its first four days in the United States. By April 2016, Miitomo had a user base of over 10 million users with 300 million conversations between friends and 20 million screenshots taken within the app itself.