When running ad campaigns, it's common to add a notification in a workflow that shows where a new contact came in from. These notifications today can do into the Message Center, however they cannot include UTM parameters, so there is no way to know where they came from.
In GHL we have a huge list of merge tags available to us to use in emails and notifications. In CF2 we currently have 4... plug any custom tags you add to a customer profile.
Please add more merge tags...