https://www.youtube.com/watch?v=amZaTjG5AOs
Yang, S., Lin, S., Carlson, J. R., & Ross, W. T. (2016). Brand engagement on social media: will firms’ social media efforts influence search engine advertising effectiveness? Journal of marketing management, 32(5-6), 526–557. doi:10.1080/0267257x.2016.1143863
https://www.youtube.com/watch?v=tfx2CjqtCUI&t=92s
https://www.youtube.com/watch?v=GbjrmfIvPho