Who are they?

A hip young film-making duo from New York. Their documentary debut Catfish has provoked debate about whether it is genuine. Supersize Me director Morgan Spurlock apparently called it "the best fake documentary I've ever seen".

A compliment of sorts. What's it about?

Schulman's 24-year-old brother Nev. He's a photographer and is sent a painting of one of his pictures by an eight-year-old girl. She's an art prodigy and pretty soon Nev is Facebook friends with her mum, Angela. Next thing he's cyberflirting with her 19-year-old sister, who sends him MP3s of her singing sensitive acoustic numbers.

And Joost and Schulman film all this?

Yes. As I said, they're hip young New Yorkers; they film everything. Nev later travels to Michigan to meet the family, none of whom he has met in person. Angela turns out to be a dream documentary subject – too good to be true, according to the Catfish bashers.

What's your verdict, real or fake?

It's impossible to believe they made up Angela. Honestly, she's fascinating. Could they have baited her for the making of the movie? Maybe. Ethics aside, Catfish is disconcerting and finally very touching. Here's the critic from the New York Times: "I say this with a heavy sigh, this is, by far, one of the most intriguing movies of the year."

What are the film-makers saying?

They strenuously deny all charges of trickery. Expect the controversy to run until its release in mid-December.