Political advertisements on Facebook exhibited strong evidence of financial investment from Russia to disrupt the 2016 American election. Facebook made its practices of self-regulating political advertising transparent in November 2019, the time of the General Election in Taiwan. The advertising policy of Facebook prohibits non-Taiwanese from buying political advertisements. Because of the lack of laws and regulations regarding social media advertising, this study examined the purchase of political advertisements on Facebook. This study discovered that algorithms on Facebook help buyers identify voters. Political advertisements on Facebook purchased by anonymous third parties create political polarization. Unknown individuals and marketing firms play crucial roles in social media campaigns, but their practices of purchasing political advertisements and content are not transparent.