To celebrate this milestone, the company is initiating some changes to Facebook.
Facebook past its prime?
As of Tuesday, according to Mark Zuckerberg, Facebook has hit the two billion mark for monthly active users - i.e. more than a quarter, and almost a third, of all of humankind uses Facebook every month (with the planet's estimated population now at 7.5 billion).
Facebook-owned Instagram has more users, 700 million, than Twitter, 328 million, and Snapchat, 225 million, with the latter valued somewhere between $25 billion and $34 billion. In addition, more than 1 billion people use Groups every month.
Facebook has announced that it now boasts 2 billion monthly active users.
Kvitova wins Aegon Classic final for 1st title since attack
Barty won her first 11 points on serve, and conceded only one point in her first four service games. Kvitova clung on and the match changed course.
Facebook added that the 2 billion people number refers to "people connecting and building communities on Facebook every month".
He said in a Facebook post that he is proud of the role his company is playing in connecting people around the world. Facebook made an average $4.23 per user in the first quarter. If Facebook were a country, it would be the most populous.
Zuckerberg is faced with a daunting challenge: How to keep growing when a huge chunk of people connected to the internet already use Facebook. Shares of Facebook were down 1% Tuesday. "Now let's bring the world closer together". It'll also react when a user wishes someone happy birthday, or when they create a new group.
He also wrote, "One guy I met told me he doesn't think city people in Omaha understand rural areas like North Platte or even know they exist".