https://techcrunch.com/2021/03/01/twitter-vaccine-misinformation-labels-strike-system/

Twitter announced Monday that it would begin injecting new labels into users’ timelines to push back against misinformation that could disrupt the rollout of COVID-19 vaccines. The labels, which will also appear as pop-up messages in the retweet window, are the company’s latest product experiment designed to shape behavior on the platform for the better.

The company will attach notices to tweeted misinformation warning users that the content “may be misleading” and linking out to vetted public health information. These initial vaccine misinformation sweeps, which begin today, will be conducted by human moderators at Twitter and not automated moderation systems.