Google introduced an extension for Chrome to help fight content farms.

Generally speaking, content farms are a real headache for search engines. In this case, the “content farm” will be understood not as a company that produces a large amount of more or less useful content, “honed” by high relevance for highly specialized requests (Demand Media, for example), but sites that are literally crammed with very weak content, often not just weak, but consisting of a meaningless set of words. Most of these sites are created solely in order to get traffic from search engines, in order to further "drain" and monetize traffic (ie visitors).

These sites are sometimes very high on search results from Google and other search engines, and search engines try their best to deal with such resources. However, there are no reliable methods of struggle, and last year, Mett Cutts, head of the search quality and anti-search spam department at Google, acknowledged a temporary defeat in the fight against content farms.
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The standard article on the farm is written by a “schoolboy” (to reduce the cost of a post) and contains a certain number of keywords to enter the top search results for a specific query (well, for example, “buy a martian”). It is clear that no one is going to buy Martians, and content with commercial key phrases that allow monetizing incoming traffic is displayed in the top.

So, here we go back to Google and its extension for Chrome. The anti-spam anti-spam department decided not to create another automated utility, but to seek help from users. Now, a Chrome user who has installed the Personal Blocklist extension for his browser can mark dummy sites and thus hide them from the results of personal output. The extension is available in English, French, German, Italian, Portuguese, Russian (!), Spanish and Turkish.

In the future, sites that have been marked by the maximum number of users as a “content farm” will be lowered in Google search results. So far this extension has been positioned as an experimental one, however, apparently, this method may turn out to be quite working.

Via CNET