Dorsey's political ad ban is a worthy dare to all social networks, which have become hostage to abuse and manipulation with their growth-at-all-costs mentality (Kara Swisher/New York Times)

Kara Swisher / New York Times:
Dorsey's political ad ban is a worthy dare to all social networks, which have become hostage to abuse and manipulation with their growth-at-all-costs mentality  —  Twitter will no longer allow political advertising, a move that places Twitter and Jack Dorsey in stark contrast to Facebook and Mark Zuckerberg.