As for what should your sandbox be, you have a few options. The easiest is to start a blog. That’s what this site was started as: a sandbox for learning content marketing, and it only became my full-time job on accident. A blog is a perfect sandbox for learning digital marketing since you can test almost all of the tactics on it, it’s low-cost, and you’ll improve your writing in the process.
It is called implied linking as there is basically no link to go back to the source site. Brand mentions and online citation must be handled carefully and well-incorporated into the site content; this is done in several forms. In the content, the brand mentions are generally connected to the products or services, and how those are connected to the content is explained. It can be in the comments what is finally implicitly integrated well into the content also. So long as the brand or website name is used, a brand name or citation is created.
Communigator - CommuniGator's core platform functionality caters to email marketing with automated welcome series, a HTML editor for designing your emails, templates, responsive design, dynamic groups, integration with the leading CRM platforms and so the list goes on. On the marketing automation side they track prospect activity across the web pages they visit on your website and the email content they engage with.