The name says it all. This cool tool allows anyone to highlight text on any web page, add a sticky note, and share the link. It seems like a very useful and friendly tool for teachers and students.
A bookmarklet can easily be installed to your bookmarks bar as a Firefox add-on to allow for highlighting on the go. If you find something you like when browsing the web, highlight it and get the link with the click of a button.
Try it for yourself by selecting the highlighted text below.