Social media is frequently used for the promotion activities of companies. Advertising and promotional activities began to be shaped through the "influencer". The influencer is carries out the marketing activity. Influencer types are examined in three separate groups considering the number of followers on social media. These; mega-influencers, macro-influencers and micro-influencers. The marketing methods of social media phenomena and the effect of sales strategy on consumer decisions, mega and micro-influencers will be compared. In the study, a comparison of mega-micro influencers in influencing consumer decisions was made and it was tried to conclude which one was more effective. The shares of two influencers on youtube were used in the data collection tool of the research. The questionnaire, created as a data collection tool, was sent to 327 participants in Istanbul via Google Forms. The received answers were coded by transferring SPSS 22. The shares belonging to Promotion A Mega Influencer and Promotion B Micro Influencer were compared. Descriptive Statistics and Chi-square test were used for comparison. In the comparison, it was concluded that Promotion B, which is the share of Mikro Influencer, had a greater effect on the purchasing behaviour of consumers.