The following document has been corrupted. Tell me what "@placeholder" is referring to.

Document: (CNN) -- As always, Mobile World Congress, the world's largest mobile telephone extravaganza, is being held in Barcelona this year. But it really should be held in Geneva, close to where Mary Shelley created Frankenstein. That's because, with our increasing addiction to our mobile phones, we are in danger of creating a monster that we are less and less able to control. Exaggeration? When was the last time you went out without your smartphone? How naked, how lost, do you feel without your mobile device? How much essential data, I mean really personal stuff that you wouldn't want anyone else to see, does your mobile phone contain?
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Digital commentator Andrew Keen says our mobile phones are becoming uncontrollable monsters
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Keen says our dependency on our mobile devices leaves us open to dark side of technology
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Our only salvation lies through protective legislation -- and from knowing when to switch off, he says 
Meanwhile, my earlier @placeholder allusion is already being used by writers to describe our digital future.
Frankenstein
The context uses the references to Frankenstein and Mary Shelley. These are used as an analogy for our increasing addiction to mobile phones.
"That's because, with our increasing addiction to our mobile phones, we are in danger of creating a monster that we are less and less able to control." This hints at the fact that "@placeholder" refers specifically to "Frankenstein", who was created by Mary Shelley through her writing novel named "Frankenstein"..