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 Josh and Emma have been friends pretty much their whole life because they live right next door to each other. They used to play together all the time, but at one moment, something happens that makes them grow apart. When Josh gives Emma the AOL CD-ROM, they connect over their little Facebook secret and they grow closer again. 
 Through Facebook, they discover little facts about themselves in the future. Who they're going to be marrying, how they're going to be feeling, even what they will have for dinner. And every little thing that they do, affects what happens in the future. They keep trying to make subtle changes in the present, hoping it will affect the future in a way that they'll be happy with it. 
 I liked the characters most of the time. Sometimes they did stupid things, which made me want to yell at them, but overall, they were pretty likeable. The chapters alternate between the two main characters. Josh was initially written by Jay Asher, and Emma by Carolyn Mackler, but sometimes when one of the authors couldn't quite figure out what to do with a scene, they give it to their partner to see if they can write something better, so they really wrote it together. 
 The romance, and the book in general, was too predictable, but still enjoyable. 
 I didn't quite like the ending, it was too open for me. They never find out how Facebook got on her computer, and you don't find out what happens to them and their friends. (Especially Kellan! What happens to her little... thing?) 
 It's weird to read this book and think about how they have never even heard of things like Twitter, blogs, and status updates. They're constantly confused about the stuff they come across. The setting was great, you could definitely see that it was set in the '90s. Computers had just been invented, only the rich kids had cell phones, you couldn't go on the internet and on the phone at the same time, there were pay phones everywhere, and they were always 'playing' outside. 
 I liked the story and concept. I highly recommend this, especially if you are a '90s kid and/or use Facebook.