I first saw that meme at least 5 years ago but yes, it's true isn't it? I use Faceache and the female of the species seems to particularly favour posting pictures of their next spot of tuck. Even stuff like pie and mash with liquor. Yuk.
No, not the actual pie and mash, that's yum, but a picture of it? Not the most appetising thing in the world.
Over time one becomes aware of what people are obsessed with - their dog or other pet; their weight; their hobby or sport, especially marathon runners; the band they play in, the list goes on. Myself, I post jolly interesting pictures of my crochet work