From your Medium post:
> no one has pointed out any substitutes or similar services, which leads us to believe we’ve built something that doesn’t exist yet.
Sorry to burst your bubble, but this has been done before. I distinctly remember someone launching the exact same product on Warrior Forum because of the intense negative reaction it got. Website owners were very upset and felt it was evil to add your own content onto someone else's site. Sadly I can't remember the name, I assume it didn't go very far because my searches aren't turning up any results.
I hope this doesn't take off, but if it does it will be a great way to instantly recognize non-respectable websites or social media accounts. I've read that YC invests as much in the people as the product, so maybe you'll end up creating something different.