There are two main types of such search engines. The first type is one that combines multiple search engines; this is called a meta search engine. Examples of meta search engines are:...
There are differen kinds of multiple search engines: Webcrawler.com, metacrawler.com, dogpile.com are searching both Google, yahoo, bing at the same time, and give results from both engines....
I had a similar problem and tried for months to sort it out. In the end I used a company to help. They are called ClydeStan. http://www.clydestan.com There is lots of info on their site how they do...
I use Facebook Search service listed below. It allows to search all Facebook stuff without logging in. So, it doesn't record your searches for sure. Also it allows to search all facebook updates on...