As far as I can tell, the argument was, "All 50 women I know are on Facebook, therefore less than 1 in 10,000 women have noticed their Facebook photos are harve

As far as I can tell, the argument was, "All 50 women I know are on Facebook, therefore less than 1 in 10,000 women have noticed their Facebook photos are harvested for use on shady dating websites." That doesn't logically follow. I'd argue your remark is an ad hominem attack because latched onto my use of the word "bias" rather than refuting my argument with data.