Social media influencers have become a popular marketing tool because they can generate buzz for businesses and draw attention to them. The main objective of this study is to determine the effectiveness of social media influencers by examining their informativeness, entertainment value, source credibility, source attractiveness, and product matchup. In this study, quantitative and descriptive research were used to achieve the research objectives. A Likert scale survey with feedback from respondents aged 18 and above who have followed, "liked," or watched any influencers on any social media platform was used to get the feedback from respondents. Convenience sampling method with a data set of 421 respondents collected and analyzed with SPSS software. The findings have shown that the informativeness, entertainment provided, source credibility, source attractiveness, and product matchup of the social media influencer pose a significant relationship towards consumers’ attitudes, which in the end affects their purchase intention positively. The results show that except for the entertainment variable, which was not supported, The Theory of Reasoned Action (TRA) was adopted for this research.