mastodon.world is one of the many independent Mastodon servers you can use to participate in the fediverse.
Generic Mastodon server for anyone to use.

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InspireCitizens

@Inspirecitizens is a teacher-created collective that empowers all students & educators to co-create globally-minded, holistic, & customized project-based learning environments.
See our pathways to globally-minded, project-based learning, as well as innovative teacher trainings, which actively inspire community-driven action, identity, & learning.

inspirecitizens.org