Facebook, Google+, and LinkedIn Can All Auto-Preview Links. Why Can’t Twitter?
Drop a link to a New York Times story in Twitter.com, and you’ll see a URL. Drop the story in Facebook.com, GooglePlus.com, or LinkedIn.com, and you’ll not only see a URL; you’ll also see the name of the publication right under it, followed by the headline, a brief summary, and a related image.
As Mat Honan puts it, “Instead of an unparsable string of characters that may or may not lead to Goatse, you get a working summary of what you’re about to see.”