Fact Checking websites
Here under some links to fact checking sites of reasonable quality (the first two seem to be great investigative journalism sites with an opposite bias).
More to come later (you may add some!). Here a couple more, related to Global warming:
https://wattsupwiththat.com Generally fair climate science criticism with open discussion
https://skepticalscience.com/ (critical review on competing(?) site: "truth about skepticalscience")
https://friendsofscience.org/ (critical note: their declared opinion creates an auto-bias going forward)
related to fact checking: https://junkscience.com
In time we should do some ranking, with the more reliable ones higher up.
An very primitive ranking will now be introduced by starting hereunder:
Blacklist of unreliable or extremely biased fact check sites
It should be noted that Wikipedia also has a list of fact checking sites:
Free discussion here: Special:WikiForum/Fact_Checking_websites