question and question from video

video-http://www.nytimes.com/video/us/100000003841604/blacktwitter-after-ferguson.html

1.          

How did technology(video) and social media (twitter, Instagram tumbler, Facebook) help to enable the black lives matter movement?

2. How did the three people highlighted become activists?

3. What does Zellie Imani mean when he says we don't rely on the mass media. we rely on ourselves

4. what did u learn from the video?

other question : What role is social media playing in the growing divide between police and African Americans?