Facebook quietly added link previews to Facebook comments today, according to Tech WD.
The link preview display has been a part of Facebook for quite some time, including a thumbnail image and short description with links posted in status updates. Until today, links posted in comments on those statuses remained mere links.
As of today, those links in comments are being converted into the same preview format that posts benefit from. YouTube videos will be viewable from the comment and regular links will come with a thumbnail, title and description.
This change only affects comments on Facebook.com — not those on third-party blogs using the Facebook Comments plugin.
This sounds like a good change to me, though I’m sure comment threads are going to put on a lot more weight from now on.