The purpose of this study was to 1.) to study the purchasing behavior in online social networks on Facebook 2.) to study the factor of service marketing mix On the acceptance of the purchase decision in the social networks on Facebook is quantitative research (Quantitive Research) collect primary data. (Primary Data) using a test with buyers who used to buy goods and services through the เครือข่ายสังคมออนไลน์เฟซบุ๊ค were 369 were analyzed to compare average. (t-test) to compare the difference of personal factors in terms of gender. And comparative analysis of variance (F-test) to compare the differences of the personal factors in age, marital status, income per month. The effect of the level of importance of marketing mix factors that influence the purchase decision in social network Facebook. Different?