There are several subs that are potentially useful for supporting an interest in learning more about Mid Century Modern style. These will generally be more useful for interest in furnishings rather than architecture.
The above are not all equally good resources. For example, r/1950s is mostly not about furniture and architecture and r/Thewaywelived is mostly not even about the 1950s.
My firsthand experience of r/midcenturymodern suggests to me they are elitist snobs with a toxic culture. Maybe good to read but not so much for posting. Assholes gonna asshole and usually can't be cured.
R/midcenturymodern was found via the comment on this post: 1950s Interior
In that sub (r/Thewaywelived), you can filter to find posts tagged 1950s.
R/midcenturymodern was found via the comment on this post: 1950s Interior
In that sub (r/Thewaywelived), you can filter to find posts tagged 1950s.