corrys

Hypothesis is a great idea but in my opinion is overly complicated for most users. I was very excited about Google Wave as well and that didn't didn't turn out very well. Birdy is very different - it works on most modern devices and is very intuitive. Everyone used comments before - now you just can comment on any page instead of relying on website owners to provide you with a platform.

Good point but I think it goes without saying that all social apps are worthless without a user base. I hope the convenience and advantages of this approach will attract future users.

I am not handling all unique URLs as truly unique - they are normalised. So actual pages where you would want to leave comments - say some business' home page or a Twitter user's feed - will have a unique URL and will allow multiple users to discuss content. Something like https://youtu.be/PcdMU-H9Jts and https://youtu.be/PcdMU-H9Jts?t=899 are kept as aliases in my DB and will have the same comment tree.