Don't Touch Him, He Might Have a Virus
No, not some communicable disease, but a computer virus. Technology is wonderful, everytime we come up with something new it destroys the basis for much of the sci-fi that is out there. If you have read any of William Gibson's work of the Cyberpunk genre, you know about his futuristic vision of "hackers" eventually having cybernetic implants that will allow them to directly connect their brain to computer systems. Well this advancement changes all that. You don't need any external implant with conductors, simply using what we've had for thousands of years will allow us to interface with each other or with other systems.
Imagine a computer virus run rampant with this sort of technology. "Wearable" Computers are becoming more fact that fiction, and soon you'll be tightly integrated with them. Current viruses (virii?) nowdays do little more than send themselves out to other people, and try to infect them. However, will the Trojan Horse programs of the future be able to take over people's minds? Hmmm....sounds like an idea for a novel.