Back End
List of social networking services
en.wikipedia.orgCheck this long list to see if any of these are worth buying/licensing instead of building a back end.
switching.software
switching.softwareGuide for ActivityPub users - SocialHub
socialhub.activitypub.rocksHow the Open Social Web Will Change Everything, with Bluesky’s Jay Graber
flipboard.videoEmbed videos & playlists - YouTube Help
support.google.comHow to embed YouTube widget on my website
Brave Search
search.brave.comcrm software for social media with thousands of videos