You can use Buffer (Business, or Awesome packages) to publish your JobBoard.io RSS feed to Facebook, Twitter, LinkedIn and Google+.
To setup your feed, log into your Buffer account and check you are on the Business or Awesome plan. If not, upgrade to unlock the 'Feeds' functionality.
Then, click feeds and simply type in RSS feed address. You can access an RSS feed of your jobs at the following URL: www.yourdomain.com/jobs.atom. Then confirm your choice.
Once you’ve wired up the jobs feed, you’ll see jobs begin to fill up in your feed list in Buffer. These posts are listed chronologically with the most recently published ones at the top.
With feeds, adding content occurs at the click of a button. Click on “Add” next to the article you want to share, and the job post will fly right to the queue on your chosen social network.
You can also use IFTTT to automatically publish your JobBoard.io RSS to Twitter or Facebook
You'll need to create an IFTTT account, then, when prompted, enter your RSS feed of jobs. You can access an RSS feed of your jobs at the following URL: www.yourdomain.com/jobs.atom
These will be posted automatically.