Well facebook today announced in a post that It will be launching a special feature for its commenting system which will allowed people to add photos , videos and links to the comments with proper preview..
"Today we are launching a commenting feature that allows you to embed videos, photos, or web sites in comments just by including a URL. Your comment will include a video player, a thumbnail of a photo, or a brief overview of the web site being linked to. If you prefer your comment without the preview, you can remove the preview with one click."
Below is the pic how your commenting system will be look like..
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