CEO Mark Zuckerberg

The idea is to make it easier for people to donate to charities without leaving Facebook. Nonprofits can now create project or theme-based fundraising campaigns with set donation goals. Users will be able to send money in just a few taps, provided they've already stored their card information on Facebook.

Facebook's also rolling out a shiny new "Donate" button that can be added to both pages and posts, so people can donate without even leaving their News Feed.

The number amounts to one-seventh of the Earth's population.

Monday's milestone was mostly symbolic for Facebook, which boasts nearly 1.5 billion users who log in at least once a month. But CEO Mark Zuckerberg, who founded the network in his Harvard dorm room 11 years ago, reflected on the occasion with a post.

"`I'm so proud of our community for the progress we've made," 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."