Parler is having a moment

Why a conservative pop-up network bears watching

(Olivier Douliery / AFP)

From time to time a group of disaffected users of a mainstream social platform will decamp to an upstart, voting with their feet against a hated incumbent. In the more innocent days of 2018, a set of Instagram users fed up with the app’s ranked feed exiled themselves to Vero, an app that offered a stream of photos and videos in r…