I don't know if you can connect to facebook, but you can share your post on facebook. Here is a post from a "whale" account that explains the "nsfw" tag. Hopefully it helps.
https://steemit.com/steem/@neoxian/dear-steemit-if-you-post-naked-or-near-naked-women-you-must-use-nsfw-and-do-not-use-any-work-safe-tag-like-steemit-steem-bitcoin