Schulman fell in love with "Megan" - but also spoke to her mum Angela, half-sister Abby and stepdad Vince online.
At the end of the documentary Schulman discovers "Megan" was a fake account run by Angela using a family friend's photos.
He uses the metaphor to describe Angela, saying there are always "catfishes" in our lives who keep us alert, active and on our toes.
Schulman later turned the documentary into the ' Catfish' TV show, where he helps others solve their online relationship mysteries.
There are two types of victims - the people who are duped into trusting someone with a false identity, and those who have their personal photos stolen and used by someone that isn't them.
Here are some of the most recent cases of catfishing: The fake accounts are often used to spark up online relationships.
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Join us and receive access UP TO 10 VOYEUR SECTIONS on the site instantly!Unknowing victims will fall in love with women or men they meet online - with no idea the person behind the screen is someone completely different.Catfishers use the accounts to give off a persona they wish they had - with plenty of friends, photos and attractive qualities.Your information is transmitted via encryption between you and payment system.We never see your credit card or personal information.