Social news sites are a type of social media that crowd-source some of the functions of an editor and curator. These sites let users decide which story is worthy or unworthy of being featured on the front page. The decision is usually influenced by the member’s personal tastes, background and the freshness of the story.
Each user typically has the privilege to vote on a submission. The most popular stories are then featured on the front page of the site or it becomes the top story for a particular category.
The most popular social new sites like Reddit often cover a wide variety of topics. Others tend to specialize on a particular niche like DesignBump whose members are mostly designers.
Social bookmarking started initially as a way for users to “bookmark” a link for reference or future reading. Once these sites started to rank the popularity of the links being bookmarked they became similar in scope and function to social news sites. For simplicity both have been lumped into one category.
Communities have grown up around these sites. Lively discussions and debates about popular issues, and their innate social nature have made them very popular with a significant amount of users.