Social media has become one of the main means for disaster victims to ask for help and get news, updates and official instructions. It lets friends and family know they are OK. Conversely, the hurricane triggered its own virtual storm of fake news and hoaxes -- some of them genuinely dangerous.
Religion remains a powerful force in American life and is capable of uniting people from different communities. A religious revival now, in reaction to the dangerous outburst of overtly racist and anti-Semitic ideology, would have numerous precedents in the previous Great Awakenings - a series of Christian mass revivals that swept America from 1730 to 1980.
After a white supremacist rally in Charlottesville turned violent last weekend, social-media users have been going through images of the event with a fine-tuned comb, "outing" participants to the Internet at large.
The President was duped into sharing a tweet from a person masquerading as someone else online. The Twitter account was tied to a pro-Trump e-commerce operation selling knockoffs of Trump campaign memorabilia.
Blocking unwanted followers on social media, or "kicking losers to the curb" in technical parlance, is an unquestioned right of private citizens. But what about politicians? Can elected leaders, when using social media in their official capacities, scrub their follower lists of unwelcome critics?