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the fb:login-button tag may not be what you want. I would create your own button and then use the facebook javascript Login method to login your user.
<button type="button" onclick="doLogin()">Log in Here PPL!</button>
then in a script tag
var doLogin = function() { FB.login(function(response) { if (response.authResponse) { //they're logged in! we've got them! location='/product/sell_it_now'; } else { console.log('User cancelled login or did not fully authorize.'); } }, {scope: 'email'}); }
from here: https://developers.facebook.com/docs/reference/javascript/FB.login/