For Instagram users here, if you are concerned about copyright of your pictures, this is what I understand from the posted article as well as other articles about this:
1. The new rules were changed only very recently, after facebook fully completed the acquisition of Instagram.
2. The overzealous lawyers pretty much changed the terms of use to include all rights to use and re-sell your images on instagram.
3. Even if you have privacy set on your images, they can still use or sell your images and make it public.
4. There is no "opt out" of this clause as long as you stay a user of instagram after Jan 16, 2013.
5. The only way to "opt out" is to delete you account before Jan 16, 2013.