this got to be a hack of some one account. Possible on mintpal. Strangely enough PND seems to also been gone on huge dumps and i cant find anyone on their forums to give a valid reasons.
like i said. on august 30 i got an email of "failed loggin" from mintpal. Perhaps they got lucky with some one old account that doesn't check on karma often enough to realized he has been hacked.
.........
thoughts
Who knows but Socoban showed movement from some accounts out of what likely is an exchange. Not sure how much one person could have had on an exchange but last time it was both Mintpal and Cryptsy. It would be interesting to know when the coins were moved there.