Spotify, the digital music service, has added about half a million new subscribers in the two months since plugging into Facebook’s new entertainment platform.

The announcement that Spotify has reached 2.5 million paying subscribers comes after a rocky period for the Anglo-Swedish start-up, with launches in four new European countries offset against a renewed debate about artists’ earnings from streaming services.

Spotify was one of Facebook’s key launch partners for its “open graph” in September.