RSS feeds are particularly useful for posting on social networks you or your clients who aren't active. It is a form of Social Media Marketing. With Twitter, it is okay to post the same article multiple times, even on the same day; so, don't think if you post with RSS you can't manually post at different times during the day for a period of multiple days. For a piece of content you want to feature, you can write multiple tweets marketing it in different ways and schedule the day/time for them out to tweet.
These are the benefits of RSS Feed in Digital Marketing-
1. Share trusted sources in Quick and easy way.
2. Feed the latest content of your website to multiple social media sites at once.
3. Positions you as a resource for great content.
How to Set Up RSS to Feed Your Social Media Accounts?
Identify the RSS feed URL for the site, it can be for your authors/writers profile or the product category you want to feed. Go to the tool you would like to use to feed to your social media via RSS Readers Digg Reader, Feedreader Online, CommaFeed, FlowReader, Feedly are a few that support RSS. They have free and paid options available. Choose one which has a clean user interface, is lightning fast, and works well on laptops/desktops or smartphones. But constantly review your options to make sure it's still the right tool for the job. Look for another option that matches your needs as some people need a more comprehensive web-content-reading experience.
Based on which tool you choose, set up your RSS feed following their instructions. For all the WordPress websites if you simply add the word feed then you are able to access their RSS at the end of the website URL. If someone is more concerned about privacy, then he can host his own RSS reader using the free and open-source CommaFeed.