The purpose of this research is to study demographic characteristics towards buying decision on cosmetic product of consumers in Bangkok. The Research also involves in studying behavior of consumers to purchase the cosmetic product via beauty blogger. The methodology through questionnaire is a primary and qualitative research methodology through in-depth interview is supportive. The data is collected from 400 samples whose age are more than 18 years old and 9 key informants from 5 areas. The research found that the demographic majority of respondents are female aged between 18-30 years old Bachelor’s degree and single. Their monthly income are less than 10000 baht. The evaluation of alternative selection post-evaluation problem recognition and information gathering mostly affect the buying decision respectively. The research also reveals that occupation affects the buying decisions especially business owners because of either their higher income of their beauty concern.

The purposes of this research were (1) to study the usage behavior of social media for the purpose of reading or viewing beauty products based on blogger recommendations (2) to study factors of blogger recommendations of beauty products (3) to study the behavior of decision making to purchase beauty products based on blogger recommendations (4) to study personal factors and behavior of decision making to purchase beauty products based on blogger recommendations (5) to study the relation between the usage behavior of social media for the purpose of reading or viewing beauty products based on blogger recommendations and the behavior of decision making to purchase beauty products based on blogger recommendations and (5) to study the relation between factors of blogger recommendations of beauty products. 400 persons were included as a sample. The data was gathered by using questionnaires and being analyzed by methods of calculating frequency percentage average standard deviation one-way ANOVA and multiple regression analysis. The results of the research were as follows; Considering the usage behavior of social media for the purpose of reading or viewing beauty products based on blogger recommendations. It was found that most consumers decide to purchase beauty products because of an interesting product presentation and the facial beauty products are the most purchased products by the consumers. In an overall picture the consumers agree with the factors of blogger recommendations of beauty products at a very good level and the factor of blogger is the most agreed factor.