Hot on the heel of WhatsApp’s announcement that it has surpassed one billion monthly active users, Google announced that Gmail has done the same, which makes it the seventh Google service to reach a billion users after Android, Chrome, Google Maps, Google Play, Google Search, and YouTube. To put into perspective how many users that it, that means that about one-in-seven human beings on the planet use Gmail on a regular basis. In reality, a significant number of Gmail’s users have multiple accounts, which means that there aren’t necessarily a billion Gmail users, just a billion accounts.