Methods for preventing search engines from indexing irrelevant content on a page?

I would go with your JavaScript option. It has two advantages.

I would go with your JavaScript option. It has two advantages: 1) bots don't see it 2) it would speed up your page load time (load the comments asynchronously and unobtrusively, e.g. Via jQuery) ... page load times have a much underrated positive effect on your search rankings.

Javascript is an option but engines are getting better at reading javascript, to be honest I think your thinking too much into it, Engines love unique content, the more content you have on each page the better and if the users are providing it... its the holy grail. Just because your commenter made a reference to star wars on your toaster review doesn't mean your not going to rank for the toaster model, it just means you might rank for star wars toaster. Another idea would be, you could only show comments to people who are logged in, collegehumor do the same I believe, they show the amount of comments a post has but you have to login to see them.

I don't think you see just how big the comment/page content ratio is. If you'd search for, for example, "how to register", you'd get lots of comment hits on irrelevant pages, before actually getting the page that has information about how to register. Simply because out of the hundreds of comments that some of the pages have, several of them will be talking about registering.

– Blixt Jan 2 '10 at 8:59 yeah I see that now, editing my original answer – Dom Hodgson Jan 2 '10 at 10:08.

Googleoff and googleon are for the Google Search Appliance, which is a search engine they sell to companies that need to search through their own internal documents. It's not effective for the live Google site. I think number 1 is the best solution, actually.

The search engines doesn't like when you give them other material than you give your users so number 2 could get you kicked out from the search listings altogether.

This is the first I have heard that search engines provide a method for informing them that part of a page is irrelevant. Google has a feature for web masters to declare parts of their site for a web search engine to use to find pages when crawling. google.com/webmasters/ sitemaps.org/protocol.php You might be able to relatively de-emphasize some things on the page by specifying the most relevant keywords using META tag(s) in the HEAD section of your HTML pages.

I think that is more in line with the engineering philosophy used to architect search engines in the first place. Look at Google's Search Engine Optimization tips. They spell out clearly what they will and will not let you do to influence how they index your site.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.