For Facebook Mark Zuckerberg "sharing" is not enough old. He puts focus on the online communities and groups, which bring people world together but also, increases engagement and advertising revenue for the world's largest social network.

Zuckerberg outlined his latest vision at a "communities summit" held Thursday in Chicago. It's the company's first gathering for the people who run millions of groups on Facebook, a feature the company rolled out years ago.

For those who have never come across them, Facebook groups are ad hoc collections of people united by a single interest, who can use the service's group features for sharing thoughts and photos, offering support and organizing events. Groups have evolved over the years to encompass hobbies, medical conditions, military service, pets, parenthood and just about anything else you could think of.

Facebook's CEO announced new moderation tools for group administrtors, such as insights into how and when members are active. There are also features en route for approving and rejecting member requests, scheduled posts and group-to-group linking so similar groups can see one another. Facebook is also making it easier to remove bad actors in groups, removing everything they've posted at the same time the member is kicked out.

Beyond the new tools, Facebook is changing its mission statement. The social network believes it should "give people the power to build community and bring the world closer together." Facebook's next big mission is getting half of its more than 2 billion users into communities, and will be implementing more AI and other initiatives to make that happen. The company has already been quietly tweaking its algorithms to include more recommendations about groups that users might want to join.

All these moves would also have the effect of encouraging people to spend more time on Facebook, which could boost the company's profits. While the company doesn't currently place ads in its groups, it is almost certain that it will in the future.

If users are spending time on Facebook, they're seeing more ads. Increasing user engagement is a necessity for Facebook, as it gives them more room to place advertising and to generate revenue.

Facebook's sole source of revenue is advertising. The company it brought in almost $27 billion dollars in 2016, 57 percent more than the previous year.