In Facebook apps, when using the JavaScript SDK, if you don’t use SSL, bugs will occur such as it not working properly in IE.

To use the JavaScript SDK, since Facebook Connect can mostly be used with SSL, if you were previously using:

Just replace it with:

and you’re done.

Note that when https pages have mixed non-secure connections, some browsers (especially IE) may not work properly.

【Reference】

・JavaScript SDK - Facebook Developers

That’s all from the Gemba.