Want to see a textbook definition of irony? Look no further than Indexeus, a search engine that primarily exposes the info of malicious hackers caught up in the very sort of data breaches that they inflict on others. As it was originally structured, people had to "donate" $1 for every record they wanted to purge from the engine's index; in other words, they had to pay to avoid the wrath of their fellow thieves. This was ostensibly to create "awareness" of susceptibility to attacks, but critics have complained that it amounts to extortion.