About three months ago, following the arrests of five members of an Anonymous spinoff hacker group, an FBI official declared: "We're chopping off the head of LulzSec."

Perhaps they did. But activist hackers, some still claiming the LulzSec name, seem eager to prove that they are no more destructible than the Lernaean Hydra -- the mythical water serpent with many heads, which could grow back two heads if one was cut off.

One report this week said that the group calling itself LulzSec Reborn "posted about 10,000 Twitter usernames and passwords on Pastebin. The leaked Twitter accounts are from people who use TweetGif, a third-party app that lets users share animated GIFs."

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