I'm interested in your Kindle script. I'm curious about how you handle saving FB posts—do you just copy and paste the content, convert it to markdown, and store it in Obsidian? Would love to hear more about your process!
Regarding Facebook, I do it manually only for selected posts. I tried to do it otherwise, but Facebook exports don't have data about likes (it would be helpful to filter popular content) or comments (often more important than the original post itself).