In its latest study of Americans’ online habits, the Pew Internet & American Life Project found that a substantial chunk of internet users want to voice their opinions online. Websites that want to remain relevant should strongly consider building in ratings systems that allow visitors to leave input about what they find on the site.

More than 33 million Americans, or a quarter of all adult internet users in the country, have rated a product or service, the study said, underscoring the value of ratings systems that give users input about content or products they find online.

One of the most interesting findings for website operators is that the survey “speaks to a large number of online Americans who are interested in contributing,” said Lee Rainey, a director of the Pew Internet & American Life Project.

As part of its ongoing project, Pew recently distributed a questionnaire asking whether individuals took part in online rating, or reputation, systems. The most recent study follows a previous report that showed that 44 percent of American adults had contributed thoughts or content online.

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