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.
