What are the benefits of Social media marketing?

We need to write 10 pages term paper for class “Intercultural management and global marketing” Our group topic is “advertising”, and my specific topic is “Advertising in Social Media” , we need to create proper research question for this topic something as ” Why social media marketing is effective?” or “What are the benefits of Social media marketing?”
-Must to use some theory like U&G theory ( uses and gratifications)
– Some references from scientific articles from scopus.com or something like this
– Examine some case as in presentation ( I attatched)

I’ve also attached some readings from the class

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