Some movies are best seen without knowing anything about them. CATFISH is one of them. Even the title itself is a red herring (if you'll pardon the pun).
It's a documentary in which two filmmakers start shooting the photographer who shares a studio with them. Then about a third of the way in, the plot takes a surprising twist. At this point, I will say no more, other than:
VERY VAGUE SPOILER!!!
This is a WAY more interesting view of the online experience than SOCIAL NETWORK.
I very highly recommend the film. It's on video now.