Facebook has added a new feature to comments on posts. If you include a link in a comment, it will provide more info/images similar to how it works when you post a link as a status update.
Facebook announced the feature via a caption to a Wall Photo, which said:
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.
This will certainly improve conversations on Facebook. I have often found myself including a link in a comment, and wondering if it would even get clicked, particularly when there's nothing in the URL to indicate what it is. This will help with that.
Sometimes a YouTube video is the perfect response to a question. Seeing the additional imagery may also grab the attention of people who weren't already in the conversation and draw them in.
Nearly 30,000 people "like" the update.
If you don't like it, you can remove the extra stuff after you post it.