There have been a bunch of these companies. We started one company in 1999, which we eventually moved to San Francisco. We built sticky notes which were stored together with a cash copy of the website on our servers. So one could collaborate around the notes in a corporate environment. Funding dried up in the dotcom crash, so we went home again.

Other companies built public note systems. I think I have seen another four or five since then that have tried to make a business around sticky notes in websites, but nothing seems to… stick (ahem).

People seem to want to give internal feedback to the content team on PDFs or in emails.

One of the original browsers, maybe Netscape, had comments on pages, but it got removed early on.

That's very cool.

Third Voice[0] did shared annotation in ‘99.

[0] https://en.wikipedia.org/wiki/Third_Voice

Say Yes to WebStickies :P

I thought this was Google’s initial goal.

I remember something where you could doodle and comment on any website, but pages usually devolved into spam and drawings of... you can imagine.