acebook fan module has no activity feed

Iveth,
I'm not sure. I've never seen that issue before. It doesn't look to directly be a JFBConnect problem. If you use your Page URL in Facebook's example page, you'll see the stream is missing there too:
developers.facebook.com/docs/reference/plugins/like-box/

Doing a little investigation, there was a bug report of this from a user today on Facebook:
developers.facebook.com/bugs/383829044969888
You may want to click the "Does this repro describe your issue?" link and fill out the details to help Facebook reproduce the problem and make a comment at the bottom.

Unfortunately, this is out of our hands.

Hope that helps get you started,
Alex

The Activity Feed module is completely loaded from the client side through Javascript. It wouldn't be your server that is blocking it in any way, it would be something on Facebook's end (since obviously not every client has a problem).

I honestly think you're just afflicted by the Facebook bug I mention above and will need to report it to Facebook.

Hope that helps, and sorry I don't have any better answers,
Alex