What is the Fb.ui feed picture size limits?

Question

I'm using the Fb.ui feed and I'm trying to find the picture size limits/requirements. Not all of my images appear using the feed, and I'd like to know exactly what the image requirements are. This is not well documented.

Answer 1

I'm pretty sure the open graph image rules apply:

An image URL which should represent your object within the graph. The image must be at least 50px by 50px and have a maximum aspect ratio of 3:1. We support PNG, JPEG and GIF formats. You may include multiple og:image tags to associate multiple images with your page.

What is the size of the image you are unable to post?

Answer 2

From my testing, the max size is 320x320. It'll keep your aspect ratio within those bounds.