This site is anonymous. No one knows who anyone else is.
Well that makes all the posters boasting about how wonderful their relationships are (and elsewhere, about how middle class or thin or rich or whatever else) even more pointless than the ones sharing a day with people who have opted to see it. If you want anonymous strangers to be impressed by anonymous you, it shouldn't be too hard to see why people might want to share with others whom they DO know.
I mean, you go on to say this:
Not that I have posted about my relationship here either and I think others have done purely in response to the lame playground jibes about being jealous.
The site's anonymous, you're anonymous, I'm anonymous, yet it's still very important to you to let us all know that you haven't posted about your relationship, presumably because you think that makes you better. And you're sympathetic to the posters who have been stung into doing it over accusations of jealousy. It's all anonymous, so why do any of you care? But you do, so why wouldn't people care when it's NOT anonymous?
The Facebook V Day posters might look silly to some people, but they're not tearing anyone down and their audience has chosen to see the content.