Pearce Delphin, a 17-year-old Australian high school student from Melbourne unwittingly caused a massive hacker attack on Twitter that sent user to Japanese porn sites. Delphin whose Twitter account is @zzap who lives with his parents in Melbourne said he admitted exposing a security flaw, but didn’t create a self-replicating worm.
Delphin said all he wanted was to see if a JavaScript really could be executed within a tweet. So he tweeted a piece of mouseover JavaScript code that brings up a pop-up window when the user hovers their cursor over the message. But the Scandinavian developer Magnus Holm soon took the idea from what he saw Pearce did and then added extra code to make the worm retweet itself.
But, Holm thought the worm wouldn’t do anything. So he wrote, “meh, this worm doesn’t really scale. The users can just delete the tweet 
,” Then he noticed the tweet started spreading virally, affecting thousands of users and causing chaos to twitter site for about five hours, until the issue was resolved by the engineers.
