To post the item you created/published in social networks:
1) Click the "Embed & Share" button (this will open the embed & share dialog)
2) Click the "Share Link" tab in the embed & share dialog and copy the link
3) Post the link into your social network feed (e.g. Facebook, Twitter, LinkedIn, etc). The item title/description/image/ will be auto-populated to the feed
Important Note: if you added the item to your site, share the item from your site so that the returning traffic will go to your site (where the item is located) rather than to the item landing page on Opinion Stage.