With "Sidewiki", visitors can share their opinion about the entire page or a selected piece of text, and it's even possible to embed videos into the post.
A doctor might have a professional medical insight to share on a Web site about swine flu myths, for example.
Or Sidewiki can be used by tourists to get inside information from locals about their town or main attractions.
MORE: Watch Google SideWiki Video
New web page users can learn from previous site visitors, and they can vote on the comments ones they like. That way, certain comments are voted up, and others are voted down. The best comments appear on top.
It all sounds great, but some web site owners are not happy with the new feature.
This blogger says Sidewiki has the potential to take comments away from his website to Google's toolbar. He's afraid the new feature will take pageviews away from his Web site because commenters will go to Sidewiki instead of his page. He also believes that if the new feature is used widespread, it will force Web site owners and visitors to use Sidewiki instead of another commenting system.
Many are also worried that the comments will be full of spam.Google says that won't be the case, since comments won't be anonymous. All posts link back to the commenter's Google profile page. Google believes that will give posts credibility and therefore reduce spammers.
The software giant is not inventing the wheel with this move. A few publishers already had developed their own commenting systems.
Add a Tweet launched in July. It looks a lot like Google's SideWiki. The difference is that AddaTweet lets users comment on web pages with tweets instead of regular comments.
Competitor Kutano launched soon after that with a similar service. And now, Big Guy Google has joined.And that could make it a lot harder for these smaller start-ups.
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