Twitter's Blue Check Verification System Under Scrutiny.

A bug on Twitter allowed previously-verified accounts to add their legacy 'Blue Check' back to their profile for free by adding the words "former blue check" to their Twitter bio. However, the bug may have only caused the check to appear for the profile owner themselves, and it appears to be fixed now. The legacy verified check mark was used to demonstrate the authenticity of accounts belonging to businesses, celebrities, politicians, activists, and journalists before Twitter Blue replaced it.