One billion people have used Facebook in a single day for the first time, prompting founder Mark Zuckerberg to hail the figure as a "milestone".
The social network announced that it had reached its billionth user in October 2012, but Monday was the first time in its 11-year history that the total daily users had crossed the billion mark.
Facebook has nearly 1.5 billion users who log in at least once a month, the company says, and it claimed that more than half of the world's internet users visited the site at least once a month.
In a post on his Facebook page, Zuckerberg wrote: "On Monday, 1 in 7 people on Earth used Facebook to connect with their friends and family.
"When we talk about our financials, we use average numbers, but this is different. This was the first time we reached this milestone and it's just the beginning of connecting the whole world."
Zuckerberg said Facebook had blazed a trail in connecting communities globally and that he is "proud" of the company's success.
He wrote: "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."