you can't access Mastodon
Small nitpick. Lemmy communities are present on Mastodon and can be followed and replied to by Mastodon users. One can see a comment written by someone from Mastodon. We only can't follow a Mastodon user or Mastodon tags from Lemmy
Example: https://mastodon.social/@VoxAliorum@lemmy.ml/115167313865117114