They detect when a whole bunch of reviews are posted at exactly the same time, or are posted on a fixed schedule, or use extremely similar language, or with a brand new account...
Basically they use spam-detection techniques on reviews.
They detect when a whole bunch of reviews are posted at exactly the same time, or are posted on a fixed schedule, or use extremely similar language, or with a brand new account...
Basically they use spam-detection techniques on reviews.