11/15/15 - Nick Bockwinkel passed away at age 80 on November 14, 2015. R.I.P.
10/26/15 - Linking to an image page (but not a direct image URL) in a tweet will show a thumbnail of that image embedded in the tweet when expanded on the stock Twitter website. Due to Twitter Card limitations, the thumbnail is low-quality, but better than nothing. It also doesn't seem to work in any third-party apps, including TweetDeck.