Answer by Nix for Facebook API - Re-Size Feed Picture
The answer to this is no. If you want to be able to reference a picture, and resize it then you need to actually post a picture and set the captions on that.
View ArticleFacebook API - Re-Size Feed Picture
I am using the feed api to post status messages with pictures. I do a post with parameters like:message: 'My Message'picture: 'https://......./myimage.png'caption: 'this is my caption'height: '150'...
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