(New Scientist) The internet is stuffed with garbage. Anti-vaccination websites make the front page of Google, and fact-free "news" stories spread like wildfire. Google has devised a fix – rank websites according to their truthfulness.
Google's search engine currently uses the number of incoming links to a web page as a proxy for quality, determining where it appears in search results. So pages that many other sites link to are ranked higher. This system has brought us the search engine as we know it today, but the downside is that websites full of misinformation can rise up the rankings, if enough people link to them.