Social bookmarking is a way for users to find, manage, organize, and store web content that they need to revisit and share with others. Since social bookmarking sites are web-based services, you can access your bookmarks online and from any device.
How social bookmarking works
Social bookmarking site services are centralized online services where users can store and share online links or bookmarks with other community members.
These sites often provide a combination of organizational and social tools, allowing users to annotate and categorize their bookmarks and comment and discuss topics with other interested users.