What are the differences between a mass and a crowd? What is an…

What are the differences between a mass and a crowd? What is an…

-What are the differences between a mass and a crowd? What

is an example of each? What sets them apart? What do they share in common?
-Do you think social media is an important tool in creating social change? Why, or why not? Defend your opinion.
-Is Black Lives Matter a social movement? What is the mission of Black Lives Matter? Who started this movement? What changes is this organization seeking to make? What is your reaction to this movement?  https://www.scientificamerican.com/article/from-civil-rights-to-black-lives-matter1/