Bradley Scott Sayer, the 18-year-old who opened fire in a California library on Monday, was part of 764 network-adjacent Com groups that spam child abuse material online. He was also connected to mass shooter copycat groups online, and even had a Roblox account with an avatar in a KMFDM shirt (a nod to Columbine). The overlap between "TCC" (online mass shooter fanclubs) and Com/764 has been growing rapidly over the past year, morphing into a brand new threat. It shouldn't surprise anyone to learn that I'd encountered Sayer's online group in the past. And, as always, we reported them to X and to authorities, which still didn't prevent the inevitable mass shooting.