PUBLIC MARKS with tags bookmarks & SearchEngine

How it works In today's modern Internet, search engines have full control over the web, they can make sites be the center of attention or make them disappear altogether in a flash. A web site that is not referenced by Google, Yahoo or MSN is virtually nonexistent to the average user

Social Discovery meta search engine

What is Simpy? Simpy is a social bookmarking service that lets you save, tag and search your own bookmarks and notes or browse and search other users' links and tags. You can be open and share your links with others, or keep them private. Simpy also helps you find like-minded people, discover new and interesting sites, publish your bookmarks, detect and eliminate link-rot, etc.

I've heard the words 'social bookmark', 'digg', 'technorati' mentioned in articles about Wikio but I find it quite different: