This will be a service that watches a mastodon user (or users) and records, over time, changes in their followers (who's (un)followed them) over time. Over time additional metrics will be included, like that ability to see posts made around times of significant follower changes.
For my plans with this app, see Roadmap.md
For info on authenticating with Mastodon, see AuthNotes.md
For sample Mastodon Follower data, see MastoFollowers.json