Paid search results will still pass that information to the advertised site when users click to visit them.

The feature is likely to appear on Yahoo and MSN, two sites for which Overture provides paid search results.

For now, Amplify intends to generate revenue though banner advertisements at the company's Web site and though paid search results (as Google does).

Trustpilot is one of the review platforms that have a licensing agreement with Google where their reviews are listed as ratings within Google's paid search results.

SEM includes both paid search results (using tools like Google Adwords or Bing Ads, formerly known as Microsoft adCenter) and organic search results (SEO).

Companies vying for the same position on a list of paid search results may click often enough on a competitor's ad to push the rival over its spending limit - knocking them out of paid search listings temporarily.