What's the best tool for multiple people to publicly annotate PDFs?

I'm launching tokenreview.co and the basic v0.1(?) is Google Drive + Docs (I know, yuck)... But I need PDFs, and I need public commenting: So how can I host PDF files (publicly) in a 'library' where people can add comments as discussion points?
Posted 
Your recommendation
🤓 Have a recommendation? Join to share.
1 recommended
  1. The easiest to use of the online proofing apps.
    CommentsShare