Facebook feed dialog picture size - facebook

On a website we have a Facebook share button. With Facebook's javascript version of it's Feed dialog, a user can upload an image to his timeline. As Facebook indicates, we are using an image size of 1200px by 630px. It all works, only the picture is rendered small. What do we need to do for Facebook to render a larger size?

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How to post a large image to user's Facebook timeline

I am building a site that lets users browse 3d images. I have added a facebook share button. That button works, but it shares the URL and only a small thumbnail (the thumbnail only works sometimes).
Is it possible to create a button that shares a large custom image, in the same way that you upload a photo to your own timeline?
I cannot use meta tags, because the images change through javascript.
I also cannot let facebook find the image automatically, because it is rendered in a canvas 3d viewer on the webpage.
Thanks in advance!

How to post to Facebook timeline using format like pinterest?

When you share a photo from a Facebook album it gets diplayed "full width" layout in the timeline (about 567px wide) with a caption below.
I also noticed that shared images from pinterest get shown im a format with an image and caption underneath.
But when I share a photo from elsewhere using the "picture" property of the feed dialog, or a page containing an og:image tag, it always gets displayed in thumbnail (116x116)|text layout.
The images from pinterest are posted as actions, so that may be a clue.
Feed dialog will not get you this customization you will need to use Open Graph actions.
https://developers.facebook.com/showcase/pinterest/
Also for full width photos from applications, the user must have generated the photo from the app so that you can utilize "User Generated Photos"
For example the following is from the Tumblr application
https://developers.facebook.com/docs/opengraph/howtos/adding-photos-to-stories/

Upload photo to facebook page of the timeline

I made a small facebook application for upload a image to facebook fan page timeline.
I'm sending a image via /page_id/feed url and no problem, image has been showing on my fan page timeline. But image size too small.
I want upload a photo to my fan page timeline with a diffent way using /page_id/photos url and this method working. But at this time, image post has been showing on "Recent Posts by Others on MyFacebookFanPage" and not showing on my fan page timeline. And I, cannot share this image on my fan page.
I'm using this facebook perms : publish_stream, manage_pages, photo_upload
How can I post a image to the my fan page timeline without
Thank you,
Regards.

Enable visitors to share large image from website to their Facebook wall

How do I enable visitors on my website to like/share an image on my site and have a large image appear on their wall ... the same size as if they were to like/share a wall photo (300px wide) ... instead of the thumbnail (90px wide).
I can get the thumbnail size to appear using the basic like/share button, but I want the larger wall-size photo to appear.
This is not possible with the current plugins. You should file a bug with Facebook at http://developers.facebook.com/bugs so it can be added to the wishlist.

how to display the correct image when sharing to facebook, Facebook open graph meta

Here I have set a image url by the og:image tag, but when sharing to the facebook, it doesn't show the correct image that I just set, instead it shows lots of images that doesn't appear in that page.
I've tried to enter the URL on the Facebook debugging system, but it shows no errors.