Is Facebook a Scaling Success Story?

Facebook, or as it's now calling itself, meta platforms, until a recent stockdrop, had a market cap of around a trillion dollars. Do you see facebook as a scaling success story, or as a cautionary tale about scaling? I see it is both. Facebook is a great example of a good that has network externalities. If only two of my friends are on facebook, actually not a very important service for me. But if all of my friends and all of their friends are on facebook,. that becomes much more valuable to me.