One of the new additions to the search aggregator Google News, Bing News, and others is a new fact check label. They are using a select group of news sites and including their articles marked as fact checks.
Fact checking can be very subjective, since often the statements are not purely measurable. To determine true or false, there is interpretation that is required to arrive at something that is measurable. This interpretation of the statement and distilling it down into something that can be verified is an area where these fact checkers fail.