@carlosdixon – I don’t know that you can.  When you scan a QR code with a mobile device, it tends to open on your Facebook app within that device (at least my Samsung Galaxy does).  So I don’t know that you could direct it outside of your wall.

Does anyone else know a workaround?

@carlosdixon Have you set your landing page to be on the iFrame tab? I had a similar problem, we made a welcome iFrame tab for our Facebook page, but it was still directing fans to our wall. You should change the default landing page to your iFrame tab….by doing so your facebook link will go directly to that page. I’m assuming through your QR tag, it would be directed to that tab as well. Hope this helps!

Edited to gather two subsequent posts.
Did you try to insert in your URL an indication to the specific tab you want?
Let’s assume your page is located at
http://www.facebook.com/*********
You could specify in the URL a tab (to be more precise, a facebook app) by adding this code to the url
?sk=app_*************
replacing the * characters with the ID of the app you used for that tab.
A practical example:
http://www.facebook.com/youtube
is youtube’s facebook page
http://www.facebook.com/youtube?sk=app_200432273314371
is the “top videos” tab of that page.

But I have to warn you that this trick works on computers (on mine at least, Google Chrome on windows 7) … not necessarily on phones too.As @lisaschulteis pointed out, phones tend to behave differently from PCs.

Oh, I was forgetting THE small hint.
Don’t go crazy trying to identify the app ID.Just hover onto the link to the tab and see the URL in the bottom-left corner of your browser. (on Chrome it’s bottom-left at least)
PS: I have tested the whole thing with my Galaxy Note, and here are the results.It works like a charm, but only if you have installed on your phone a browser which allows User Agent Switching. If the phone is auto-redirected to m.facebook.com (standard behaviour, since Facebook knows which device you connect from) this won’t work. Because iframe tabs won’t work.So maybe you could link that QR not to the iframe tab, but directly to the web page from which the iframe pulls content.
PPS: (I like writing, did you notice it? ) likify earned a place into my bookmarks, but it’s beta and it is clear. Come on, it even does not center the page! As stated before I have a GNote, which has a screen with a PC resolution. My “likify-like-page” was very small (and that’s ok, it is my elephant-phone’s fault) and in the top-left corner (which made the whole thing look terrible – imagine it on a tablet!)
I tried to be clear but English is not my native language, so please be patient and ask if something is not clear (or tell me if something is wrong).