What is the overall effect of Social Media Sentiment on Stock Prices?

Research Questions:
1 What is the overall effect of Social Media Sentiment on Stock Prices? (Causal)

2Dose Social Media Sentiment affect the stock return of small or large companies?( Casual)

3 How do the reactions of companies and investors on social media affect the stock
performance of the companies? (Casual)

4 What are the relationships between the size of the company as a moderator and stock prices?