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.
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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.