lish er ▁of ▁Wikipedia ▁inform ▁its ▁readers ▁of ▁the ▁conditions ▁on ▁these ▁lic enses , ▁and ▁give ▁credit ▁to ▁the ▁original ▁author . ▁ ▁Te chni ques ▁ ▁Depending ▁upon ▁the ▁objective ▁of ▁a ▁scra per , ▁the ▁methods ▁in ▁which ▁websites ▁are ▁target ed ▁differ . ▁For ▁example , ▁sites ▁with ▁large ▁amounts ▁of ▁content ▁such ▁as ▁air lines , ▁consumer ▁electron ics , ▁department ▁stores , ▁etc . ▁might ▁be ▁rout in ely ▁target ed ▁by ▁their ▁competition ▁just ▁to ▁stay ▁ab re ast ▁of ▁pr icing ▁information . ▁ ▁Another ▁type ▁of ▁scra per ▁will ▁pull ▁sni ppets ▁and ▁text ▁from ▁websites ▁that ▁rank ▁high ▁for ▁keywords ▁they ▁have ▁target ed . ▁This ▁way ▁they ▁hope ▁to ▁rank ▁highly ▁in ▁the ▁search ▁engine ▁results ▁pages ▁( SER P s ), ▁p ig gy back ing ▁on ▁the ▁original ▁page ' s ▁page ▁rank . ▁R SS ▁fe eds ▁are ▁vulner able ▁to ▁sc rap ers . ▁ ▁Other ▁scra per ▁sites ▁consist ▁of ▁advert is ements ▁and ▁paragraph s ▁of ▁words ▁randomly ▁selected ▁from ▁a ▁dictionary . ▁O ften ▁a ▁visitor ▁will ▁click ▁on ▁a ▁pay - per - click ▁advert is ement ▁on ▁such ▁ ▁site ▁because ▁it ▁is ▁the ▁only ▁compreh ens ible ▁text ▁on ▁the ▁page . ▁Oper ators ▁of ▁these ▁scra per ▁sites ▁gain ▁finan cially ▁from ▁these ▁clicks . ▁Ad vert ising ▁networks ▁claim ▁to ▁be ▁constantly ▁working ▁to ▁remove ▁these ▁sites ▁from ▁their ▁programs , ▁although ▁these ▁networks ▁benefit ▁directly ▁from ▁the ▁clicks ▁generated