In his first few paragraphs, Scott tries "to give some of the flavor of 'Catfish' without spoiling it outright."
But be warned: There is a big, not entirely unsurprising twist that lies like a booby trap in the middle of the film, and the choice is either to reveal what happens or forgo a discussion of the movie’s logic and meaning. The directors and the distributors would obviously prefer the second option, but the expectation of discretion is a trap. So consider yourself warned. I’ll try not to spell out too much, but neither am I willing to play along in a rigged game.