Yup. We don't like it either. We're working on a way to enter a 'key' so that you have to type something like:
{ JFBCLike key=12345}
This way, if a user leaves off the key, the Like box won't show. This will be more important once we get the replacement for {JFBCLogin} working, which should be in the 3.1 release.
Sorry for the inconvenience.