History of Twitter Policies
October 2019: Twitter bans all political ads worldwide.
February 4, 2020: Twitter may label tweets containing synthetic and manipulated media as well as show a warning to people before they Retweet or like the Tweet; reduce the visibility of the Tweet on Twitter and/or prevent it from being recommended; and/or; Provide additional explanations or clarifications, as available, such as a landing page with more context.
March 2020 provides advertising for WHO and public health agencies. Promotes content from credible COVID-19 related sources. Broadens their definition of "harm" to encompass contact that contradicts public health guidelines for COVID-19.
May 2020: Twitter introduces new labeling system which allows the platform the flag misleading tweets related to COVID-19.
June 2020: Twitter prevents users from retweeting an article without them first reading the article.
September 10, 2020: Twitter began to label or remove false or misleading information intended to undermine public confidence in an election or other civic processes.Adds increased account security requirements for accounts of prominent political figures.
October 2020 Twitter declares that that users cannot claim an election win before it is called and cannot tweet claims meant to interfere with election processes. The platform added a prompt to credible information when users tried to retweet tweets that had been labeled as violating policies against misleading information.
January 2021: Twitter launches birdwatch, a community driven misinformation labeling effort. They will allow users to identify information they believe is misleading. They plan to expand this so that users can later put notes on tweets that will be visible for everyone. For now these notes are only visible on a separate site. Users could no long reply to, like or retweet Tweets labeled as violating the Civic Integrity Policy. They began labeling Tweets that contain misleading information about Vaccines.
February 2021 Twitter will use labels to identify official government accounts and state-affiliated media in order to boost transparency. This policy does not affect unverified accounts, which are still often used by prominent figures like Iran's Supreme Leader Ayatollah Khamenei.