Do you have any details that could point to an identify of the thief - real or virtual identity? If so, you could start a thread in the Reputation or Scam Accusation boards of this forum. Getting someone ostracized from the community does have its benefits.

Aside from that, you should share your story so others can protect themselves. Were you careless with your account? Are you putting the blame solely on Poloniex on for this one?