Compared with Diigo, Just Paste It doesn't hit the mark. While the concept is cool (making individual notes to share with friends), I cannot tell if there is way of tracking notes, other than keeping track on a blog. With Diigo, you have a Library where your bookmarks are found.
Then again, I might be comparing apples and oranges. Maybe they are two different sites and function in different ways. I invite you to try the website out for yourself. Leave your thoughts in the comments section.