In this tutorial, we’re going to build a system to allow users to add comments to the bottom of your web pages, which is becoming more and more popular lately for a variety of different applications. For example, blogs are now starting to allow users to add comments so readers can join in the discussion, and tutorials have comments sections where users can add their own notes, or comment about the brilliance of your writing for example. The system could also be used to create a guest book application for a site; in fact the principles can be used for pretty much any system which allows users to add data.

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