Using journalists’ photos and videos, as well as live-streamed videos from rioters, untold Twitter users and Instagram accounts have been feverishly working since Wednesday to ID and name the participants who stormed the halls of the Capitol, ransacking lawmakers’ offices and occupying the House Chamber.

Some, like the Instagram account @homegrownterrorists, amassed huge followings in a few hours. When posters believe they’ve identified someone, the images are updated with names and details about the person — like their social media handle, hometown or job title.

The FBI has been attempting a similar tactic. The Washington field office tweeted dozens of images of rioters on Thursday, asking the public to help identify people. Through early Thursday, police said they arrested 69 people from at least 20 states and the District for charges ranging from unlawful entry of public property, to violating curfew and assaulting a police officer. The department is also offering a $1,000 reward for tips that lead to an arrest.