A lot of websites offer affiliate programs where you will get paid if you refer someone. Normally, you get paid only when the person you refer buys something but in other cases you can get paid for simply referring someone and gets extra money when they buy something. The most popular way to advertise their affiliate links is to post their links online on forums and social media. Some people may even start spamming links everywhere hoping that someone will join, which may result in a large quantity of low quality backlinks being generated. My question is, do you think affiliate programs harm your SERP because people can spam their affiliate links on low quality sites? However, lots of websites seem to use affiliate programs.