Google keeps track of what sources you're more frequently clicking on and weights results subtly but noticeably. If you look up things on Wikipedia a lot, Wikip

Google keeps track of what sources you're more frequently clicking on and weights results subtly but noticeably. If you look up things on Wikipedia a lot, Wikipedia pages will be ranked higher. If you're more likely to click over to the BBC than to Fox when you read a news source, the BBC will be higher and Fox will be lower.