Fake sources (outside the gossip and celebrity columns and a couple of cheap tabloids in any given country) is essentially a non-issue even now.

“non-credible” anonymous sources: that’s in the eye of the beholder, I guess. It is in any government’s interest to downplay the authority of any off-the-record leak source, but political parties that rail the hardest against anonymous sources generally have more to hide, and generally those stories prove substantively true in the long run.

It is still rare for any newspaper to predicate a story on a single uncorroborated anonymous source.

If you have examples it would be interesting.