Yes, you can unlink them from the social media account from their Constituent360 record.
  1. Go to Constituent360 > select Constituents
  2. Search for the Constituent and view their profile
  3. Scroll to the far right side of the page and look up at the menu bar (Profile, Email Preferences, etc.)
  4. Click "Linked Social Accounts" on the far right side of the menu bar
  5. If the constituent is linked to any social media accounts, you can unlink them from this page