Live-video-streaming services such as Twitter?s Periscope application and Facebook Live have played prominent roles in the fallout over police shootings of African Americans.
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The July 6 fatal shooting of Philando Castile in Falcon Heights, Minn., was captured on Facebook Live (embedded below, but please be warned, the content is graphic) by Castile?s girlfriend, Diamond Williams.

Police
Posted by Lavish Reynolds on Wednesday, July 6, 2016

Dallas resident Michael Kevin Bautista used Facebook Live to capture this video (embedded below, but please be warned, the content is graphic) of a shootout between protesters and police in Dallas the following night, which resulted in the death of five police officers, the wounding of seven others, the killing of one shooter by a police robot bomb and the capture of several other suspects.
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Posted by Michael Kevin Bautista on Thursday, July 7, 2016

And DeRay Mckesson, a leader of the Black Lives Matter movement, used Periscope to live-stream his arrest Sunday night during protests in Baton Rouge, La.
The video of Castile?s shooting had been viewed more than 5.6 million times at the time of this post, as had the video from the deadly protest in Dallas.
Facebook had been under fire for its removal (and fairly rapid restoring) of similar videos, and the social network used a Newsroom post to attempt to clarify its policies:
We understand the unique challenges of live video. W...