I may sound like I'm just jealous or bitter, but I'm not criticizing all public displays of affection. I think most of those are great. If you wanna cuddle on the carousel or tongue-tangle on the train or even mack in the movie theater, then more power to you. The world is short on love, and we must do everything we can to slather it in the milky fluids of affection. Anyone who complains about that is jealous or a My Little Pony villain. I'm also of the opinion that everyone should have sex as loud as they want, even in apartment complexes with very thin walls, and even if they live above me. That's fine; it's for the greater good. Just go to town on each other, Marty and Cynthia. Kinda wish I knew your names for a different reason, but hey, this still isn't the worst apartment I've ever lived in.
You haven't truly fucked until you've fucked on a bed of asbestos and lead paint.
The difference here is that all those things I just mentioned are primarily about stimulating the relationship, and I'm only aware it's happening because I happen to be in the vicinity. I'm a bystander, not an audience. The Facebook posts are the opposite. They exist only so you can communicate with others, and you're posting specifically so you can be sure that I see it. In the case of romantic adventures, the poster is actually stopping their celebration of what they have so they can sit down in front of the cold glow of their laptop and tippy-tappy out some gloat about it. Unless they're with your partner while they type those posts. In which case, please have better dates, because that's really sad.