Facebook plays an important role as a marketing tool in today’s business industry. Its algorithm crucially works on tracking users to provide advertisements that users may be interested in. This becomes the research issue on how their personal data were collected without their permission. This research aims to investigate users’ attitudes toward its algorithm and also focuses on the impacts of the Facebook advertising mechanism on the users’ behaviors and the users’ recommendations to adjust the advertising process. Twenty-five respondents participated in this research’s interviews, targeting 18-34 years old Facebook users. The results show that the users’ attitudes can be divided into two groups. Many respondents perceived the tracking positively as they pointed out that the algorithm suggested relevant or new products that they have not seen, which help them to compare the prices and qualities of products before making a decision. On the other hand, some respondents realized the negative effects of the tracking algorithm. This group of people avoids using Facebook worrying about their privacy. They feel like it is a kind of privacy invasion. Repetitive advertisement is another problem for many users. It is irritating for them to see the products that they have already purchased. The interviewees suggested that there should be an algorithm to check the type of products that they have completed buying. For the privacy concerns, they think it should be better if they can turn off verbal and texting algorithms on Facebook.