Difference between floodlight and Google tag manager?
Google Tag Manager helps you deploy tracking technologies and does not replace Floodlight. If you use Floodlight tags, you'll want to manage them using Google Tag Manager.
Google Tag Manager is a free tool that makes it easy for marketers to add and update website tags -- including conversion tracking, site analytics, remarketing, and more—with just a few clicks, and without needing to edit your website code.