This week, Spotify sent some unspecified portion of its hundreds of millions of users a message. The message told those users something important.

“You are one of Taylor Swift’s top fans worldwide,” one iteration of this message said. “You’re one of their top 1% fans. Hit Play on their radio and we’ll provide an endless stream of their music.”

People received similar messages about a wide array of artists in the app: Kendrick Lamar, the Barenaked Ladies, Tove Lo, the Doors and many, many more. The Spotify users weren’t always in the top one percent of fans; some messages claimed listeners ranked in the top two or three percent of the artists’ fans.

Many reacted to these messages as Spotify might have hoped they would, sharing them with friends and with followers on social media. Regina Anderson, 22, was one of many people told they were among Ms. Swift’s top fans and who, upon receiving the message, broadcast it widely.