From their last quarterly report, quarterly ARPU is 25.91 for US/Canada users, 8.76 for European users, 2.62 for APAC users, and 1.91 for the rest of the world.

From their last quarterly report, quarterly ARPU is 25.91 for US/Canada users, 8.76 for European users, 2.62 for APAC users, and 1.91 for the rest of the world. It's likely that European and US/Canada user count growth is flat or nearly so, and their gains recently have been out of getting more dollars per user through increasing advertising revenue as opposed to getting more users. It could be (or not) that they can grow those revenues even more.