NEED, a new social networking site. They get to ask for something they need and then they are requested to complete a task and then what they asked for is provided (not always in the way they expect). Soon all the students are participating and some are getting new iPods and other goodies. Then the tasks they are asked to do become darker and some kids are dying.
The main character, Kaylee, asks for something that is truly a need (not a want) - a kidney for her sick brother. What it will take for that to happen is worse than she could have imagined.
The big question of WHY? who is behind it, is very unexpected.