We could have communicated the change better, no doubt. The JFBCFan and JFBCLike modules were removed almost 2 years ago and replaced by the SCSocialWidget module. We took great pains to make sure they continued to work with subsequent releases, but should have made it much clearer that they should have been replaced by the SocialWidget module at your convenience.
It was a learning lesson for us. I'm glad it failed gracefully (didn't prevent the page from loading, white screen, etc), but would have been better to not have anything go bad in general.
Of course, if you ever have any suggestions or feedback for improvements, we're always listening.
Thanks,
Alex