Use Stumbleupon for social bookmarking and networking Save your websites and share them with other users. Save these locations as bookmarks in one central location. Organize your bookmarks by using tags you provide and share them with friends and family. Use the Stumble button to stumble upon pages that match your interests and preferences. Rate your sites and automatically share them with other users. Use ratings to determine website popularity and content not found on other search engines. See what websites other users are browsing and which ones are being viewed by most users. Go to the People section and browse through the different profiles from other Stumbleupon users. Network and meet people with similar interests and preferences as you. Register by creating a username and password.