Furthermost previous research emphasis on only electronic word of mouth (e-WOM) from e-commerce (EC-e WOM) and another research focus on social media with e-WOM. The problem is which of the two approaches is more effective and this research focuses on how e-WOM on e-commerce websites and e-WOM on social media affect customers. This research aims to compare between E-Commerce E-WOM and Social Media E-WOM and which one the consumer chooses and to prove that electronic WOM is very effective in supporting the credibility of electronic commerce and supporting sales via social media commerce. This study uses a quantitative method with a Likert scale, tests 4 hypotheses, tests the theory and the consistency of the theory from previous research. The result show EC-e WOM integrity influence is greater for EC-e WOM credibility and contributes an indirect influence to SM-e WOM. Other results show that EC-e WOM source credibility has a very large influence on EC-e WOM credibility and contributes an indirect effect on EC-e WOM adoption and the effect becomes weaker on SM-e WOM adoption. In conclusion, consumers will adopt information from electronic WOM if the information from electronic WOM is credible and integrated.