I narrowed the scope to read:account and read:follows.
Thanks for the feedback @BoF@mstdn.fr and @Gargron.
(The tool has no backend. All secrets and tokens are stored locally. You can copy the code and run it locally if you want to.)
While I didn't think about mobile use, sigmaJS works nicely on touchscreens. I assume it will quickly become unusable if you follow many people. (Hiding edges helps a lot with performance.)
@Gargron I am intrigued to visualize your followers. But that would probably take days only to collect the data.
vis.social is an open social platform for creative people, especially anyone in sciArt, data, visualization, creative coding, and related arts and research. English is the common language of the instance.