Tag Type: Select “Link Click Listener” as the tag type. It is reserved for campaigns using paid keywords. Google offers several free, online courses designed to help increase your analytics knowledge. The values for each entry are the same as specified in the Analytics section. On other such services, using a URL shortener can allow linking to web pages which would otherwise violate this constraint. Well, Twitter actually increased the maximum amount of words (to about 120) allowed in a tweet and that’s a good one. Everything is changing.
Set a custom 404 URL so both search engines and visitors are sent to valid pages on my site when trying to follow any link that doesn't exist. The framework mappings determine the event and variable values. If you're comfortable with Web hosting and setting up simple PHP and mySQL applications, there are several free scripts you can use to set up a URL shortener on your own server, giving you much more control. Many URL-shortener services offer the option to track how many clicks each link gets. So instead of seeing “bit.ly” or “goo.gl” links that might lead you anywhere, these websites have set up their own custom short domain name. There is now a “Get Shortlink” button next to your permalink when you edit or write a post, and when you click it you’ll get a popup with the beautiful link already highlighted for your copy and pasting pleasure.
Then in Google Analytics go to “Content” Then under the "Site Content" drop-down click "All Pages" And search for “pdf” to see all of the PDF's that are tagged in this way. But links can avoid suspicion and creep in and ruin websites. See if you are using Classic Analytics (ga.js) or Universal Analytics (analytics.js).