The Fulton County Sheriff’s Office said Thursday that it was investigating online threats against the grand jurors who voted this week to indict former President Donald Trump and 18 others, accusing them of conspiring to overturn Georgia’s 2020 election results. The jurors’ names are listed early in the sprawling 98-page indictment, as required in Georgia, making the state an outlier among federal and state court systems. Now some of those jurors have had their faces, social media profiles, and possible addresses and phone numbers shared on internet sites, in some cases with the suggestion that they should be harassed — though it was unclear Thursday if anyone had followed up on those suggestions. The county sheriff’s office said in a statement that it was aware of online threats against grand jurors and was working with other agencies to track down their origin.