WASHINGTON — President Trump invited some of his most ardent digital warriors to the White House on Thursday for its first social media summit. Twitter was not there and its platform was down in the hours leading up to the event — the company blamed an “internal configuration change.”

But the president’s favorite bullhorn made a timely comeback just as the summit began, and it struck me that there was no better way to document the lovefest between Mr. Trump and 200 of his most passionate online followers.