First you need to differentiate... many people are running with more than 2 to 5 alias steemit accounts alongside their original main account. Will you call these alias accounts fake?
This means to determine if an account is fake or not can only be determined by the activity that goes on on such accounts. An account that is set up just for spamming comments perhaps can be classified as fake right? but accounts that are setup to differentiate between different topics and content by same author, such accounts cannot be called fake... what do you think?

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