Huge photo sharing service with tagging and commenting on pictures, maps showing where geotagged photos were taken. Find pictures of anything, including beautiful art images. Many of the free pictures are offered via Creative Commons licenses that let you use it as a stock photo gallery.

Search hundreds of millions of people on the world's largest social network

Search for documents, books, presentations, and business, academic papers archived on Scribd's social publishing site, where tens of millions of people share original writings and documents.

Internet dictionary of slang words and phrases. More than 5 million street lingo words and expressions have been defined by the Internet community. The definitions on Urban Dictionary are meant to be those of slang or subculture words, phrases, and phenomena not found in standard dictionaries and tend to have the newest words. Entries are checked by volunteer editors and rated by site visitor…

Search the profiles of professionals around the world. People list themselves on LinkedIn and create their own professional profile including their current and past companies and job titles, city, industry, and their education.

See what's happening - right now. Twitter contains up to the second news from around the world. Search Twitter to scan for happenings before traditional news media writes about it.

Google's blog search tool organizes the biggest news and the sites that are breaking it. The service is entirely automated, and meant to be a quick way to figure out what's going on outside of mainstream media outlets

Search the Usenet discussion forums. Find something written an hour ago or over 20 years ago. Over 700 million newsgroup messages are available

BoardTracker searches message boards and forum postings and finds message threads about your topic.