That was @noganoo... he discovered a way to register hundreds of new accounts on the free signup. He submitted the exploit to @ned who gave him 100SBD. So he kept probing, found another one, and paid himself accounts instead. Grey-hat I suppose.

Anyway, if there was any sensible mechanisms of defense against spam on this platform, such an array of bots would be impossible to use and not very useful, because people could stop them posting. It's an interesting demonstration of a flaw in the system.