The same thing can be achieved, in a maybe nicer way, with http://www.words4chrome.com/, a Chrome extension that does public comments in any page ans has already a lot of users.
Thanks, I hadn't seen this before. Though there are parallels in the medium we use, the products are quite different. We do quick, private sharing with friends - not public commenting.
I've been interested in something like this for a long time, I just with the community was larger, as it is right now there just aren't a lot of comments
Their website was down but I found it here: https://chrome.google.com/webstore/detail/words/lgdfecngaioi...