New Scientist has an article on sock puppets (subscription required):
IF YOU thought sock puppets were made merely for the amusement of small children, think again. In cyberspace, a sock puppet is a vandal’s alter ego, an additional account that they use to pose as a different user and tamper with facts and dishonestly promote alternative viewpoints.
The article ends with:
And one academic was caught using a sock puppet to review his own book and to pose as one of his students. It’s not just small children that sock puppets keep amused.
They don’t mention the name of this academic, but we know who it is.