Add Fediverse Icons to Jetpack
Add Fediverse SVG icons to Jetpack's Social Menu module.
When adding a Custom Link to your Social Menu, set its Navigation Label to the platform you're linking to, e.g., 'GNU Social', 'Peertube', or 'Mastodon'.
While Jetpack itself uses domain names, e.g.,
facebook.com, to decide which icon to apply, that approach obviously wouldn't work here: federated platforms are hosted on all sorts of domains. What does work, though, is to name menu items after the applicable Fediverse platform.