Social Media have given plenty of opportunitiesto consumersin adaptingdifferent aspectsinlife.Facebook, TwitterandInstagram have played significant roles inexpanding consumers' online purchases. Though Oman and other Arabian countries are facing shortage in utilizing these sites efficiently, we still have substantial evidence of its use. This paper aims tounderstand which consumers are mostly influenced by online purchasing,reasons that tempt consumerto purchase online, types of products that are mostly purchased using Social Media and types of Social Media that are mostly used by consumersin Oman.To achieve these objectives,we conducted two primary research methods, questionnaire and interview to investigate the impact of Social Mediasiteson users’ changing behavior who aim to purchase online.The findings show that Instagram has made significant change in consumers' buying decision towards choosingparticular products.This studyhas many implications on both theory and practice.Keywords: Consumer Buying Behavior, Social Media, Online Shopping