A Facebook Group is a place for group communication and for people to share their common interests and express their opinion. They let people come together around a common cause, issue or activity to organize, express objectives, discuss issues, post photos, and share related content.
Everything You Need to Know About Using Facebook Groups for Business
Facebook is evolving to focus more on building communities, and groups are the natural tools to help forge those new kinds of connections. One billion people already belong to Facebook groups. About 10 percent of those belong to groups that Facebook has identified as “very meaningful”—communities that “quickly become the most important part of someone’s experience on Facebook.”
Since people who love a brand want opportunities to get more interactive than is possible through a Facebook Page, Facebook has recently made it easier for businesses to create their own Facebook groups.