A sockpuppet testimonial is most likely owned by a secondary ID of the subject of the testimonial.
Mmichael is probably the fellow who hijcked the board w the multiple IDs who showed up after the political arguments between myself and virtually all the old Romneyites who have since vacated.
I dont know if its in the latest DSM, but there is a certain kind of messageboard poster, not exactly a troll, but more so someone who carries on a kind of theatre of the absurd using multiple IDs. The creates multiple buffoonish identities andcarries on nonsensical conversations withthem until all other participants leave due to the noise. Even after that, the indivual carries on the show for years.
Other boards Ive seen this on are SSH and VCEL/ASTM.