The content is then mirrored with the goal of creating revenue, usually through advertising and sometimes by selling user data.
Prior to Google's update to its search algorithm known as Panda, a type of scraper site known as an auto blog was quite common among black-hat marketers who used a method known as spamdexing.
For example, sites with large amounts of content such as airlines, consumer electronics, department stores, etc.
Another type of scraper will pull snippets and text from websites that rank high for keywords they have targeted.
Other scraper sites consist of advertisements and paragraphs of words randomly selected from a dictionary.
From the advertisers' point of view, the networks don't seem to be making enough effort to stop this problem.
Some programmers who create scraper sites may purchase a recently expired domain name to reuse its SEO power in Google.
Whole businesses focus on understanding all[citation needed] expired domains and utilising them for their historical ranking ability exist.