The purpose of this study is to explore how the use of primary colors in social media advertisements influences consumers’ mental response, which was done by analyzing how consumers responded to the primary colors through cognition, emotion and perception in social media advertising posts. The theoretical framework was built on the concepts of primary colors (e.g. red, blue and yellow) and the mental response through cognition, emotion and perception.  A qualitative research approach was chosen due to the study’s exploratory nature. Focus groups were conducted since it is argued to effectively meet the purpose based on the participants' possibility to elaborate and provide the discussion with comprehensive insights. Each focus group engaged and discussed three social media advertisements, in an Instagram context, with each advertisement featuring a primary color.   Coding inspired by grounded theory was used in order to establish mental response categories. These mental responses were then analyzed and explored together with a theoretical framework to be able to answer the research question. The analysis provided the reader with an understanding of how consumers respond to SMAs and presented six mental response categories. In conclusion, there were four mental response patterns which were identified. Firstly, perception, cognition and emotion. Secondly, cognition, emotion and perception. Thirdly, emotion, perception and cognition. Finally, perception, emotion and cognition.

The fast fashion companies are growing with their cheap and trendy clothing, promoting people to adapt to new trends and to consume. At the same time, many fast fashion companies have started to advertise sustainable strategies which are communicated though social media. The aim of this research is therefore to investigate social media as a channel for fast fashion companies to communicate sustainable fashion advertisement, by looking at the Swedish market and the generation Y. A qualitative method was used, and the data was collected though semi-structed interviews. The conclusion of this study is that social media as a channel for fast fashion companies to communicate sustainable fashion advertisement, is not that effective, at least not how it is used to today. The sustainable advertisement on social media is not making the consumers of generation Y to purchase sustainable and the messages and content they communicate is not affecting generation Ys intention to purchase sustainable clothing. The communication from fast fashion companies regarding sustainable advertisements on social media should either be revised in order to meet the consumers demands, or to use another media channel to reach generation Y.