frankleeceo - 6:33 pm on Apr 19, 2013 (gmt 0)
It has to be some kind of statistical model. If you run promotions and somehow you gain significantly more links than other sites that run similar promotions. Your site gets red flagged...?
Kinda like IRS audit I shall say. Not many gets flagged at all for all the questionable things, but once you do and get put into a microscope...be aware