Sightix is a social search platform offered as a service for social networks that returns personalized relevant results to their users. The world is social, the web is social, your site is social, do you have a social search?

People Search
Find people instantly with our people search engine. It's easy to find someone, just enter their name click search. You can also add city, state, age, or zip code. Or search by address or phone number.

Audiobaba is a next generation music search engine that allows you to find songs by acoustic similarity. Until now, there was no easy to way to browse for new music.

http://www.discoversemantic.com/
a search engine for semantic web topics

The Search Engine List - Comprehensive list of all web search engines, simply laid out and easy to navigate with links to all search engines in the database.

Twingly is a spam-free blog search engine. Our goal is to create the first and best spam-free search engine and to be the most innovative web startup in Europe.

A list of major metacrawlers. Unlike search engines, metacrawlers don't crawl the web themselves to build listings. Instead, they allow searches to be sent to several search engines all at once.

meta search engine