instamentary
n. A documentary produced in a very short time, particularly one about a recent news event.
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Etymology
Examples
2013
I told you about a couple of pending TV or big-screen films being prepped about Olympian Oscar Pistorious’ fall from grace in my Feb. 15 column, but NBC News and Investigation Discovery (ID) already have teamed up on the "instamentary" breaking news special, "Beauty & The Blade Runner," premiering 7 p.m. Sunday on the ID network.
—Bill Zwecker, “Charlize Theron, Seth McFarlane: Hookup at the Oscars?,” Chicago Sun-Times, February 28, 2013
2011
Even as Hollywood movie studios scramble to put together feature films inspired by yesterday's takedown of Osama bin Laden, Discovery Channel is already working on an "insta-mentary" about the dramatic execution of the terrorist icon.
—Josef Adalian, “Discovery Channel Producing ‘Insta-mentary’ on Osama Bin Laden’s Death,” Vulture, February 05, 2011
2010 (earliest)
These news units dominate ripped-from-the-headlines documentary specials, the so called "insta-mentaries" that are a staple of ad-supported cable because the news units have the access, the resources and the relationships with the cable networks that depend on them.
—Marisa Guthrie, “Production Units a Bright Spot in Broadcast News,” Broadcast & Cable, March 15, 2010