▁called ▁Made ▁for ▁Ad S ense ▁sites ▁or ▁M FA . ▁This ▁der og atory ▁term ▁refers ▁to ▁websites ▁that ▁have ▁no ▁re de em ing ▁value ▁except ▁to ▁l ure ▁visitors ▁to ▁the ▁website ▁for ▁the ▁sole ▁purpose ▁of ▁clicking ▁on ▁advert is ements . ▁ ▁Made ▁for ▁Ad S ense ▁sites ▁are ▁considered ▁search ▁engine ▁sp am ▁that ▁dil ute ▁the ▁search ▁results ▁with ▁less - than - s atisf actory ▁search ▁results . ▁The ▁sc rap ed ▁content ▁is ▁redundant ▁to ▁that ▁which ▁would ▁be ▁shown ▁by ▁the ▁search ▁engine ▁under ▁normal ▁circumstances , ▁had ▁no ▁M FA ▁website ▁been ▁found ▁in ▁the ▁list ings . ▁ ▁Some ▁scra per ▁sites ▁link ▁to ▁other ▁sites ▁to ▁improve ▁their ▁search ▁engine ▁ranking ▁through ▁a ▁private ▁blog ▁network . ▁Prior ▁to ▁Google ' s ▁update ▁to ▁its ▁search ▁algorithm ▁known ▁as ▁P anda , ▁a ▁type ▁of ▁scra per ▁site ▁known ▁as ▁an ▁auto ▁blog ▁was ▁quite ▁common ▁among ▁black ▁hat ▁mark eters ▁who ▁used ▁a ▁method ▁known ▁as ▁sp am dex ing . ▁ ▁Leg ality ▁Sc ra per ▁sites ▁may ▁viol ate ▁copy right ▁law . ▁Even ▁taking ▁content ▁from ▁an ▁open ▁content ▁site ▁can ▁be ▁a ▁copy right ▁viol ation , ▁if ▁done ▁in ▁a ▁way ▁which ▁does ▁not ▁respect ▁the ▁license . ▁For ▁instance , ▁the ▁GNU ▁Free ▁Document ation ▁License ▁( G F DL ) ▁and ▁Creative ▁Commons ▁Share A like ▁( CC - BY - SA ) ▁lic enses ▁used ▁on ▁Wikipedia ▁require ▁that ▁a ▁repub