This simplest distinction is:
Campaigns are the information you send out, whether via email (automated, single or funnel campaigns) or a social channel (Facebook, Twitter or LinkedIn).
Mailing lists are the subscribers who receive your email campaigns.
This has always been the way FeedBlitz has worked. In this new UI, we've simply separated the two to make it easier to search and edit the different components.
The caveat when it comes to campaigns and mailing lists is with automated mailings.
Automated mailings (RSS-powered mailings) are both a campaign and a mailing list.
In the legacy UI, automated mailings were both a list and a campaign. In one sense, they're split in the new UI, however, you cannot have more than one automated campaign per mailing list. Meaning, each automated campaign must have its own mailing list.
This is important for when you're editing the settings of the campaign and the email list. You'll see below, there are two different settings you can edit:
To change the settings of the list including landing pages or activation email content or the template for activation emails, you'll select List Settings. To change items directly related to the automated campaign — content truncation, sending schedule, campaign template, and so on — you want to select Edit Campaign.
Even though a mailing list is associated with an automated mailing, you can still send single mailings and funnels to the mailing list as well.
As always, if you have any questions, please don't hesitate to let us know. You can find all of our great support resources and how to get in touch with us via email, chat or phone on our Support Page.