Unfortunately great pictures, wherever they are posted on the web, tend to be copied a lot, and regularly without asking the owner or even giving credit. This particular photo has been copied all over the place, see the results of this google image search.
In this case my guess is that the photo on SummitPost might actually be the real one. The one on Facebook has only just been posted. Perhaps the copyright owner is associated with that facebook page, or has given permission to use it. If not, then there is indeed a copyright infringement.