Facebook made the announcement within its Facebook Photos page."Today we are launching a commenting feature that allows you to embed videos, photos, or web sites in comments just by including a URL," the site said. "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."
Users who take Facebook up on the new feature can embed a small video preview, a photo preview, or a summary of the Web page in their comments. Somewhat surprisingly, in the hundreds of comments attached to the post, no one took advantage of the new capability - or, more likely, it just didn't work.
At the present, users can embed videos, pictures or links in Google+, which which launched at the end of June. Users can only attach text comments to other posts, however. Google's reach with Google+ is small - just in the millions of users, compared to over 750 million for Facebook. But the two social networks are seen as direct competitors.