Why they don't do it?
- they don't know why to tag links
- they don't know how to tag links
People who know why and how, probably use URL Builder tool by Google:
Just paste a link and click one of the buttons. It does most of the work for you! No need to think about what to put into medium, source or campaign fields.
Welcome to Simple Tag:
You can follow Simple Tag for updates here: Follow @simple_tag
Many thanks to David, Martin, Peter, Juraj, Mojmir and Pavel for their feedback!