This question already has an answer here:
Sometimes when I search for something, there are plenty of links to sites with no content (those who only have the premade templates which the search terms), spammers, and leechers (as in copying content from other sites, like B r o t h e r s o f t who leeches on SoftPedia.com).
How come they have such a high ranking without any original content (furthermore, why are they not simply banned from the results)?
And also, is there some way of filtering them out? Like for example completely exclude a domain from search results?