Sock puppetry. In online communities, the practice of a single person creating lots of accounts and pretending to be several different people in a debate so as to create the illusion of support for a particular position.
Here's a Wikipedia page that details sock puppetry on Wikipedia.
[Original pic by The Fabricators of Useless Articles]
→ in joysome pursuit of interesting ideas, a frothy cappuccino & a good movie → market segment manager at IBM → (views expressed here are my own, not my employer's)