You make an important point. For instance, just imagine when Twitter finally goes down for good. Trump’s most provocative bullshit is archived in multiple places, but the output of dozens of little Twitlers that we might recognize and consider fairly important movement figures will probably be so much dust in the wind. Historians working on Nazi Germany can consult complete archives of shit like Der Sturmer if they need to; historians working on this period might be faced with a tattered quilt.