scatterbrained, private means non commercial. Social media photos are generally non commercial in nature. The IOC is worried about commercial use of photos. In fact, what you posted is actually a cut and paste of the actual words, which makes it read different than it is.
19.6.3 Images, video and sound recordings of the Games taken by a Ticket Holder cannot be used for any purpose other than for private and domestic purposes and a Ticket Holder may not license, broadcast or publish video and/or sound recordings, including on social networking websites and the internet more generally, and may not exploit images, video and/or sound recordings for commercial purposes under any circumstances, whether on the internet or otherwise, or make them available to third parties for commercial purposes
the actual quote clearly states no VIDEO OR SOUND on social sites, but it does NOT mention photos.