One possible outcome or useful skillset is using your web developer skills to handling social media marketing and email campaigns. That means using HTML and inline CSS to craft emails.
One well known provider is MailChimp. Their knowledge base is extremely useful.
http://kb.mailchimp.com/topics/getting-started
http://kb.mailchimp.com/campaigns/ways-to-build/how-to-code-html-emails
Because HTML emails can't load external style sheets, JavaScript or use positioning like floats it's important to focus on inline styles and tables.
Handling HTML an inline styles Information on tables HTML Email Guidelines
- Read through the MailChimp knowledge base articles and practice building HTML tables
- View the source of some of your own HTML emails you've received and see how their HTML and CSS are crafted
- Test out how your HTML emails look with https://putsmail.com
- Explore MailChimp's HTML templates and try making changes to some
Familiarize yourself with Pony a simple Ruby gem to send Emails.