According to Wikipedia (as of 2/5/18):
Facebook is an American online social media and social networking service company. […] After registering to use the site, users can create a customized profile indicating their name, occupation, schools attended and so on. Users can add other users as “friends”, exchange messages, post status updates, share photos, videos and links, use various software applications (“apps”), and receive notifications of activity. Additionally, users may join common-interest user groups organized by workplace, school, hobbies or other topics, and categorize their friends into lists such as “People From Work” or “Close Friends”. Additionally, users can complain about or block unpleasant people.
Facebook is compatible with a number of devices with internet capacities, such as desktops, laptops, tablets, and smartphones.
Facebook can be operated via both personal and business accounts equipped with branding, marketing tools, and analytics.
Some features particularly relevant to online democracy include:
Groups provide a space to communicate about shared interests with certain people. You can create a group for anything — your family reunion, your after-work sports team, your book club — and customize the group’s privacy settings depending on who you want to be able to join and see the group. Learn how to create a group or join a group you’re interested in.
Businesses, organizations and public figures can connect with their customers or fans on Facebook by creating a Facebook Page. Anyone with a Facebook account can create a Page or help manage one, as long as they have a role on the Page. People who like a Page can get updates about the Page, such as posts, photos or videos, in their News Feed.
Events let you organize and respond to gatherings in the real world with people on Facebook. You can create or attend an event for anything from a birthday dinner to a school fundraiser. When you create an event, you can control who sees or joins your event.
Videos are one of the most immersive ways to share and discover on Facebook. You can share videos and discover videos in your News Feed.
Facebook is developed by Facebook, Inc. headquartered in Menlo Park, CA (US).