Rails is redirecting multiple times?

I am getting some very strange behavior where Rails seems to be sending multiple redirects to the client from one action. The code does not suggest this could happen, but I am seeing the following log entries:

Processing FacebookAppsController#post_add (for 99.230.141.157 at 2007-12-18 14:15:42) [GET]   Session ID: 382613da73aee01e1bec169f9df9c8f2   Parameters: {"api_key"=>"921198edc5e865404c05da8a71f300c2", "installed"=>"1", "action"=>"post_add", "auth_token"=>"54b130636eb352a4d53014d645cad9e5", "controller"=>"facebook_apps"} Redirected to Log into Facebook Completed in 0.09034 (11 reqs/sec) | DB: 0.05949 (65%) | 302 Found [http://production.rapouts.com/facebook_apps/post_add? api_key=921198edc5e865404c05da8a71f300c2&auth_token=54b130636eb352a4d53014d645cad9e5&installed=1] Cookie set: viewer_token=6fafdc44-0b5b-472a-b04c-12ff8bc0956d; path=/; expires=Sat, 16 Feb 2008 22:15:42 GMT Redirected to Log into Facebook <Log into Facebook? cookie_token=6fafdc44-0b5b-472a- b04c-12ff8bc0956d&app=5&referrer=42712&action=pre_add&api_key=921198edc5e865404c05da8a71f300c2&referral_token=839976c8-27dd-4be1- b68e-5791c42af7dd&campaign=61&controll> Completed in 0.07579 (13 reqs/sec) | DB: 0.07197 (94%) | 302 Found [http://production.rapouts.com/facebook_apps/post_add? api_key=921198edc5e865404c05da8a71f300c2&auth_token=54b130636eb352a4d53014d645cad9e5&installed=1]

Note that there are two redirects in there. I am seeing this happen repeatedly in my logs, so I don't think this was just two mongrels having log messages overlap as sometimes happens.

Does anyone have any ideas on this?