In a world of fakes, I sure wish there was a way to tell what was real. Twitter's blue check mark was an ingenious answer to this impossible problem. The check mark meant Twitter verified that the person logging into that account was who they said they were. Even pseudonymous accounts for political activists living under repressive regimes could reliably get their message out. To help, Twitter enacted extra protections like two-step verification to help us all trust the system. Of course, it wasn't perfect. For years, Twitter struggled to keep up with the volume of accounts that genuinely deserved…