Another thing to consider: Social science studies demonstrate that people are slow to take action in response to a warning if they don't see the danger for themselves. Twitter is filled with people posting pictures of confirmed or suspected events, and chasers posting clips and links to live streams, and clips and images of broadcasters amplifying all of this. Some of this may find some of this on Mastodon now, but there's no comparison in scale or real-time availability and interaction.