Feed dialog doesn't publish large images - facebook

Question

I'm trying to post to User's Wall large images through FB.ui 'feed' but the post only show a small image in the left side as usual. When I use the sharer.php, the image looks large. What I need to define to post large images using the Share dialog.
FB.ui({
app_id: '<%= ENV['FACEBOOK_APP_ID'] %>',
method: 'feed',
link: '<%= request.original_url %>',
name: 'A name example',
redirect_uri: '<%= ENV['HOST'] %>',
caption: 'An example caption',
description: 'An example description',
picture: '<%= ENV['HOST'] %><%= asset_path "Facebook/#{params[:page]}.jpg" %>'
}, function(response){});
I have defined an og:image, og:type, etc but now way. Share dialog only post small images.
The image are 1200x603. The only warning the debugger is returning me is about og:url.

Answer 1

This is what I exactly use:
FB.ui({
method: 'feed',
link: '<url that I would like to share>',
name: "Js name",
picture: 'http://<domain>.com/media/images/questionnaire/1/1.jpg',
caption: 'Js caption',
description: 'Js description'
}, function(response){
console.log(response);
});
and this is what I see:
There is no og tags in my link address's html. Be careful about using link attribute instead of href attribute. I spent lots of hours just for finding that I should use link attribute instead of href attribute.