PixelFed is a free, open source Fediverse alternative to Instagram. You can follow PixelFed here:
You can join a PixelFed instance at https://pixelfed.org/join
The official site is at https://pixelfed.org
You can self-host your own instance, instructions are here: https://docs.pixelfed.org/installing-pixelfed/
Managed PixelFed instance hosting (for non-technical people) is here: https://app.spacebear.ee
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!