But none of those have made a dent in a market that is increasingly controlled by Google, which processes more than 60 per cent of the search requests made around the world.

Here's how the new system, called SearchWiki, works. If you're logged into Google when doing a search, you'll get results with a series of buttons below the links. Clicking on arrow pointing upward moves a result higher on the results page. That link will come back in that new spot the next time you search on the same term. Clicking on an "X'' will delete the link so it doesn't appear the next time you make the same search.

Users will also be able to open a box to make notes about different sites so they can be read again in the future. The comments also will be shared with others who are logged in, if they click on a link for "See all notes for this SearchWiki."