"It's an honour to be on this journey with you," co- founder and chief executive said in a Facebook post.
The user base is bigger than the population of any single country, and of six of the seven continents. It represents more than a quarter of the world's 7.5 billion people.
Facebook defines a monthly active user as a registered user who logged in and visited the social media platform through its website or a mobile device in the past 30 days.
Facebook had 1.94 billion people using its service monthly as of March 31, an increase of 17 per cent from a year earlier. It reached 1 billion in October 2012.
The company, which Zuckerberg started in 2004 in his college dormitory room, uses its huge size advantage to lure advertisers, offering them highly targeted marketing capabilities based on its data about users.
The number of advertisers topped five million in April, the company said.
Facebook's growth has increasingly come from outside the US, Canada and Europe. Three years ago, those regions accounted for some 38 per cent of users, compared with about 30 per cent in the first quarter of this year.
Meanwhile, Instagram -- which Facebook also owns -- topped 700 million users in April and reached its own milestone earlier this month: 250 million daily active users on Instagram stories.
By comparison, Twitter had 328 million monthly users by the end of the first quarter of 2017.
"Each day, more than 175 million people share a Love reaction," Facebook said in a blog post, "And on average, over 800 million people like something on Facebook.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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