AntiSocial is an iOS/iPadOS app that is a Safari Content Blocker for multiple social networks and associated websites.
The blocked URLs are specified in blockerList.json
I have documented the entire journey of creating, publishing and maintaining the app on the App Store as a tweet thread.
You can find it on Twitter here: https://twitter.com/247arjun/status/1266808274189336577?s=21
Alternatively, this has been unrolled here: https://threadreaderapp.com/embed/1266808274189336577.html