Tag Manager
Google’s Tag Manager web application is a useful tool for managing scripts across the site. By inserting the tag manager script under the opening <body> tag on every page of your site, you gain the ability to add and manage third party scripts via http://www.google.com/tagmanager/ without all the hassle of editing the site code and re-uploading.
For instance, you can use tag manager to add analytics scripts, tracking codes or social sharing scripts like http://www.addthis.com/ with complete ease. The Tag Manager can be useful when scripts need to be updated, or if you need to add a new script; because the original site files remain untouched and it removes the risk of unintentional changes.
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