A graduate student at the University of Wisconsin, Madison has developed a system that allows a person to send tweets just by thinking.

Researchers use brain interface to post to Twitter
In early April, Adam Wilson posted a status update on the social networking Web site Twitter — just by thinking about it. Just 23 characters long, his message, “using EEG to send tweet,” demonstrates a natural, manageable way in which “locked-in” patients can couple brain-computer interface technologies with modern communication tools.
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