Twitter’s livestreaming app Periscope has just released its first growth report, and both users and activity is steadily rising.

According to Periscope, there are over 10 million registered accounts in just four months.

Of course, accounts don’t equate to active users. Periscope has around two million daily active users – but that’s not really important, according to the company.

According to Periscope, it cares about “Time Watched”.

“Time Watched serves as a proxy for active user growth, without suffering some of the limitations of focusing exclusively on a metric like Daily Active Users (DAU) or Monthly Active Users (MAU),” says the company.

“It’s most reflective of the value we’re creating for people and the world. Success for broadcasters means more time watched on their broadcasts. Success for the audience (viewers who are watching and participating in a Periscope) means more high quality broadcasts in their feeds that they want to watch and participate in. Success for broadcasters and their audience means success for Periscope.”

Periscope says that over 40 years of video is being watched every day – and that doesn’t include periscope.tv viewing.

As of August 2nd, there are over 10,000,000 accounts on Periscope! Thanks to every single one of you! ❤️ pic.twitter.com/DPOlgLmaSs

— Periscope (@periscopeco) August 12, 2015

Periscope just added a new feature called couch mode for endless viewing.