A number of years ago I used to post a lot of pictures to several forums. Over time, as the membership shifted in most forums, it seemed that pictures became less common. Most of the picture posters seemed to leave the forums. First facebook, then instagram made picture sharing simpler. Those other venues also allow you to restrict your social group to just people you like, which has some obvious advantages.
Even facebook has changed. It, too, has become a gathering place for a more mature demographic. The young folks with the fancy phones now use instagram, snapchat, etc. Coincidently, they are also the ones who are trying new foods, cultures, techniques, restaurants, etc. I watch what my nieces and nephews are posting to instagram and I'm blown away.
I guess after seeing those it's hard to believe that anyone would be interested in my dinner plate.