From a Washington Post story by Amy B Wang and Josh Dawsey headlined “Trump’s tweets used against him in Georgia indictment”:

In a criminal indictment filed that alleged former president Donald Trump and 18 of his associates conspired to overturn Georgia’s 2020 election results, prosecutors repeatedly cited a rather uncommon piece of evidence to undergird their charges of racketeering: Twitter posts.

It was Trump’s fourth indictment since leaving office and, like the three others preceding it, it cited a slew of phone calls, meetings and false statements to allege wrongdoing. But, more prominently than in the other cases, prosecutors used Trump’s own tweets to implicate him, pointing to a dozen of his posts on Twitter as “overt” acts that “furthered the conspiracy.”