UTM fields people can understand later.
utm_source records where the visit came from, such as instagram or newsletter. utm_medium describes the kind of channel, such as social, paid_social or email. utm_campaign groups the links that belong to one launch.
utm_content can separate two links in the same campaign, such as bio_link and story. utm_term is primarily used for search terms. The tool preserves other parameters, coupon codes and fragments already present in the destination URL.
