Facebook reached a new milestone on Monday when 1 billion people logged into the social network in a single day. "On Monday, 1 in 7 people on Earth used Facebook to connect with their friends and family," wrote CEO Mark Zuckerberg in a post on his personal profile.

Facebook has averaged around 1.49 billion monthly active users and 968 million daily active users in the second quarter of 2015, according to the company website. But this is the first time the platform has reached a billion users in one day since its launch eleven years ago.

"I'm so proud of our community for the progress we've made," wrote Zuckerberg. "Our community stands for giving every person a voice, for promoting understanding and for including everyone in the opportunities of our modern world. A more open and connected world is a better world. It brings stronger relationships with those you love, a stronger economy with more opportunities, and a stronger society that reflects all of our values."

Despite the new record, the number of worldwide Facebook users is unlikely to hit a plateau anytime soon; the site is hugely popular overseas, not just in the US and Canada (approximately 83.1 percent of daily active users are from outside North America), but it has yet break into Africa, much of Asia and parts of South America. The company is attempting to crack these regions with its Internet.org initiative, which provides free Internet access via a mobile app and website.

News of the milestone comes after Facebook announced its new personal assistant service called M. Residing within the Messenger app, M is powered by artificial intelligence that is trained and supervised by people.

Facebook's continuing success is in stark contrast to its closest social media rival, Twitter. The microblogging site's 316 million monthly users pales in comparison to Facebook's numbers, and the company has been looking at different ways to attract new users as the number of signups to the site stagnates.