I remember reading this story on the internet a few years ago. It told the story of how humans defeated an alien invasion using scams. There were no characters, it was more like a documentary piece. One of the events that I remember had to do with humans using a phony telethon and I think the Nigerian scam to make money behind the aliens back. The story incorporated several famous internet scams in it.
1 Answer
I've found it. It is called Planetary Defences by S. R. Algernon, it can be found here
Turns out it wasn't a documentary, but a subordinate describing events to his superior.