During Alphabet's first earnings call this afternoon, Google CEO Sundar Pichai commented that as of this month, Gmail now officially has one billion monthly active users. That's a lot of Gmail.

Thanks a billion for helping us make Gmail better and better!https://t.co/Rd82YqwGjl — Gmail (@gmail) February 1, 2016

The Gmail app for Android, by comparison, hit one billion installs a little over 20 months ago, back in May of 2014. And that was two years after Gmail became the most popular email service on the planet. When that occurred in 2012, Google reported around 425 million MAUs for Gmail, meaning the service has grown its active user base twice over in around three-and-a-half years.

Now if we could just see that kind of growth on Google+.