One of the best villains of science fiction is the Borg from Star Trek. These merciless cyborgs "assimilate" entire planets to add new knowledge and technology to their civilization.
Their emotionless and unstoppable tech-based hive mind (well, mostly unstoppable - see "Star Trek: First Contact") is chilling. Good thing we don't have something similar on Earth.
Actually, we do. It's called a botnet.
A botnet is a group of infected computers that is operating to send spam, steal bank account information, infect other computers and attack companies - the Zeus botnet is a good example. Usually the people who own the computers don't even know that their computer is infected.
Botnets are already bad enough, but they're about to get even worse.