(CNN) It's not only Donald Trump and Republicans expressing their indignation at the FBI's decision not to recommend charges against Hillary Clinton over her handling of classified materials on a private email server.

The Tuesday announcement also set off a torrent of anger and frustration among some of Bernie Sanders' most diehard supporters, a vocal minority who have been agitating for an indictment of the former secretary of state in the hopes it would vault the Vermont senator to the Democratic nomination.

Trump and the Sanders bitter-enders had played up the possibility, pointing to what they called an "FBI convention" that would effectively block Clinton from becoming the nominee. But with FBI Director James Comey's announcement likely closing that door, social media -- including a couple high-profile Sanders backers -- erupted: