The Guardian:

Snopes.com, a hugely popular fact-checking site which debunks urban legends, old wives’ tales, fake news, shoddy journalism and political spin. It started as a hobby in the internet’s Pleistocene epoch two decades ago and evolved into a professional site that millions now rely on as a lie-detector. Every day its team of writers and editors interrogate claims ricocheting around the internet to determine if they are false, true or somewhere in the middle – a cleaning of the Augean stables for the digital era.

I’ve been a huge fan of Snopes for decades. Whenever you hear something “incredible” on the internet, do a search for it on Snopes.