University of Washington scientists Rajesh Rao and Andrea Stocco claim that they are the first to demonstrate human brain-to-brain communication. Rao sent a signal into a Stocco's brain via the Internet that caused him to move his right hand. Brain-to-brain communication has previously been demonstrated between rats and from humans to rats.
The press release is here. It goes without saying that this could be huge. It's easy to go from this video directly into a sci-fi novel when you start to consider the implications. The idea of hacking another human being is a potent concept that sci-fi has been wrestling with for decades.