Question for the Urbit devs (when they get done celebrating and come in here to answer the questions, and sigh in dismay at the inevitable Nth round of hn-yarvi

Question for the Urbit devs (when they get done celebrating and come in here to answer the questions, and sigh in dismay at the inevitable Nth round of hn-yarvin's-bashing): In theory, it should be really easy to write a social media app in Urbit. I mean, that's kind of what it's designed for, right, to make it easy and secure to do the sorts of server-side use cases that we currently off-load to Facebook and Twitter and such? So, where is it? I don't mean a legit FB/IG/TW/etc challenger, I just mean a toy proof of concept in which I can 'add' an urbit identity, 'share' a piece of text, and they would see it in their feed. I know the easy answer is, "Why don't you write one?" Well, I'm a mediocre programmer and I already have a side project. This isn't me demanding that open source software be written for me; this is me asking, if the PoC social media site for urbit doesn't exist yet, does that mean that it's harder to make than a superficial understanding of the project would suggest?