new operators "*", "!*", "!~"

Well, that is a temporary fix, but the problem is when they visit the site outside of Facebook, the theme isn't switched to the normal theme. Too bad Drupal for Facebook does not work properly. Any other suggestions?

I've give that a try, both suggestions look promising. Thanks for the ideas - I'll report back with any progress made.

So, the system:referrer seems to work one level in. For instance when an individual clicks the custom tab, the referrer is indeed Facebook. Since my custom tab is target defined using page?facebook (using ThemeKey to switch the theme), the referrer when the user clicks a link is page?facebook and Facebook is found when running system:referrer using ~ 'facebook'. Now, after clicking the link, if you the user were to click another link, the referrer becomes my site without the ?facebook appended and the rule no longer applies.

A cookie might be the best option at this point unless Facebook for Drupal gets its act together or I can find a way to pass that $_GET variable onto each link (or, alternatively, pass it as a $_POST).

No, that still makes it so the Facebook theme is applied if the user visit the website outside of Facebook.

Installing Beta 4, just wanted to let you know that it is generating a warning on the update.php page:

"warning: Cannot modify header information - headers already sent by (output started at /home/crooms/public_html/sites/all/modules/themekey/themekey_admin.inc:3) in /home/crooms/public_html/includes/common.inc on line 147."

Update: Actually, it won't update. Generates a white page with this text: + '*' => '*', + '!*' => '!*',
Same thing happens when I try to disable a themekey entry using Beta 4

Upgraded fine, no problems with the operators and it works down multiple links into the Facebook iFrame, but he problem is still the same: if the user decides to visit the actual site on the same browser, the theme doesn't switch to the system default. It think I'll just have to keep poking Facebook for Drupal's maintainers to get their version of the feature to work properly :-(

Ah, I've found the problem: the chain doesn't evaluate when referrer is blank. For instance: it works inside the iframe, it also works if I open a new tab (which is still the same session) and search for the site on Yahoo! (the referrer is Yahoo!), but if I open a new tab and browser to the site on my own, the referrer is blank.

Is there a way to add an overarching rule we can add to the chain so it would look like

if(isset(system:referrer))
{
  if(system:referrs !* croomsalumni){
      if(system:referrer * facebook) => theme=Facebook
      else system:dummy=dummy => standard
  }
}
else system:dummy=dummy => standard

Ah, but thinking about it, that would kill the retaining properties multiple links in because it explicitly sets a new theme.

Argh, stupid Facebook for Drupal not working property. Please feel free to quit trying, this isn't your problem :-(.