On the 21st of September 2010 some time in the morning, a Twitter Hack (or Exploit) appeared and started to spread !
People started seeing blacked-out tweets and when they hovered over them they found themselves automatically retweeting them and others got redirected to other pages, however people using 3rd party Twitter client weren’t affected and saw Tweets with weird text instead.
I discovered it some time around 1pm GMT, and started to understand how it worked, and in this post I’m going to explain to you how the Hack worked 
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