These days you can login into most of the well known applications like Hootsuite, Buffer using your social media accounts like Facebook, Twitter, etc.
So how will you be able to remove such integrations from your social accounts? Well, here is the process:
Facebook – Visit the link https://www.facebook.com/settings?tab=business_tools to see the list of all connected apps/ accounts and remove them as per your requirement. Facebook calls it Business Integration.
Twitter – Visit the link https://twitter.com/settings/applications. to remove the connected applications.