The verification checkmarks were normally given to prominent people on Twitter to confirm their identity and inform readers that the accounts are authentic.
Twitter halted all new general verification of users on November 9 in response to a backlash over the verification of Jason Kessler, the U.S. far-right figure who organised the Unite the Right rally in Charlottesville at which counter-protester Heather Heyer was killed in August. "Supporting organizations or individuals that promote the above; and inciting or engaging in harassment of others".
Twitter wrote that "verification has always been perceived as an endorsement".
Twitter said through a statement that it gave visual prominence to verified account on its service, which added to the perception and the issue should have been addressed much earlier but the work was not prioritized like it should have been.
Twitter wrote that it is working on a new way to verify accounts, but in the meantime anyone not adhering to the new guidelines will see a change.
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The most prominent is Richard B. Spencer, the notorious racist activist behind the National Policy Institute, who asked in a tweet after losing verification whether it was no longer "ok to be proudly white?"
Twitter's purge of verified accounts is a commendable effort to protect its site from violence and hate speech, but this has inherent risks too.
The majority of figures impacted are aligned with the alt-right; others have links to Neo-Nazism. The rules are created to account for behaviour "on and off" Twitter, meaning users can lose their blue ticks even if they do not violate its rules directly.
Twitter said it's reworking the entire system and has already changed its official guidelines on what verification means.
The company is conducting a review of other previously-verified accounts, so it is possible - even likely - that other high profile or vocal users will lose their blue ticks. Although his verification has been removed, it's safe to say this new plan will better the content that's tweeted out daily.