Facebook is giving our users an SSL error?

If you see an error like ERR_SSL_VERSION_OR_CIPHER_MISMATCH just have your user(s) upgrade their web browser. This is 99% of the time just a case of their web browser being extremely outdated so just have them keep their browsers updated to the latest versions on a regular basis and there should never be an issue connecting to SSL ciphers that are used by CloudFlare (which are usually the latest and greatest SSL ciphers).