Facebook said it is aware of many problematic pages in Mexico, such as the shadowy page that first posted the image of the wife of front-runner Andrés Manuel López Obrador, a leftist populist who threatens to unseat the party that has dominated Mexican politics for the past century. "Amor a México," or "Love for Mexico," has changed its name three times during the campaign season and was at one time run by a Mexican supporter of former president Felipe Calderón, according to Washington Post research and research by Animal Político, a local news organization. (Until she dropped out last month, Calderón's wife was also running for president.)