Key points
A lot of Mastodon's features will feel familiar to current Twitter users, but there are significant differences, too.
Once you experience Mastodon, you suddenly realize just how much commercial advertising you are force-fed.
This is an immersive learning experience to master decentralized thinking.
Yes, maybe. Could depend on your expectations though. As far as I am concerned Lemmy is a content article reader, while Mastodon (and Pleroma, Akkoma) are for me in general be more about connecting with people and organizations and sometimes following activities of friends.