To be more precise, git clone adds the origin cloned from as a remote named "origin", unless you override this with a configuration setting or the -o option.
But git gives you nothing to handle more complicated topologies, all remotes you interact with have to result in a linear history with everything on all other remotes… unless you feel like doing a manual merge every time you update your social media feed. Making that work automagically needs another layer on top of git, none of which seems documented here.
The default is no remotes at all.