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Blogger Jason Roe pointed out a flaw in the Ryanair website that made it possible for someone to book a flight and not be charged for it. Although the writer did not book a free flight himself, he wanted the error to be known -- and therefore wrote about the error in a post on his personal blog.
How did Ryanair react? In a priceless way more suitable for a juvenile Facebook row.
The Guardian is a well-respected news source in the UK, but it may wish to be more careful with what it re-tweets.
Screenshot taken earlier this year.