Description: Reddit is a social news aggregation, web content rating, and discussion website. Registered members submit content to the site such as links, text posts, images, and videos which are then voted up or down by other members.
Type: software
Pricing: Free
Description: StumbleUpon is a web discovery platform that recommends web content to its users. It uses collaborative filtering to analyze user ratings and preferences to suggest interesting websites and articles that match the user's interests.
Type: software
Pricing: Freemium