Why am I not surprised by this. There are some smart people around, and it's only a matter if time that this comes back to bite people. We already know it's doing that for those that post foolish messages, on twitter or anywhere else.
The work raises some interesting questions, not least about privacy. Would Individuals think more carefully about placing their life history in the public domain if they knew how easily it could be distilled?
The new technique means that a detailed life history will be available at the touch of a button to friends and family but also to prospective employers, business competitors, the government, the media, law enforcement agencies, stalkers and so on.