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The Secret Crush application tempts users to install it by sending messages claiming that "one of your friends may have a crush on you!" Once installed, however, it prompts users to install Zango spyware, which is used to track online surfing and collect personal information.

Fortinet believes around one million Facebook users have been infected by the application, due to its insistence that they invite a further

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five friends before it reveals the secret crush. And as if to rub salt into the word, there's apparently no secret crush at the end of it all.

"The tremendous success and lightning fast expansion of Facebook empowered the social networking giant with an impressive user base," comments the Fortinet advisory. "Needless to say, in a digital world where web traffic equals money, such a user base attracts spammers, virus/spyware seeders, and other ethic-less online marketers like honey would attract flies."

Facebook were unavailable for comment at the time of writing.

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