Limetown

Ten years ago, over three hundred men, women and children disappeared from a small town in Tennessee, never to be heard from again.
 

In this seven-part podcast, American Public Radio host Lia Haddock asks the question once more, "What happened to the people of Limetown?"
 

The new podcast Limetown is fictional (not a spoiler, it's noted on their website), but it's executed in the style of popular non-fictional public radio podcasts like Serial, Radiolab, and that ilk.

Perhaps a medium or genre comes of age once the first spoof or satire can be made, a sign that it's achieved sufficient popularity to support such a joke? This wouldn't be the first attempt to poke fun at this genre, but it's the first native spoof I'm aware of.

Related: Fred Armisen plays Ira Glass on the Doppelgängers episode of This American Life. Armisen first unveiled the impression during a dress rehearsal sketch, but it proved too niche to connect with enough audience members so it never aired. You philistines, I think it's one of Armisen's best impressions.