The 'Social Media' section of the App Settings allows you to link out to your social media profiles from within the app.
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The fields are as follows:
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​Twitter Account: Here you will just need to enter your account name.

Facebook Page ID: You can use this tool to find your facebook ID, then paste it in this field.

Google+ Page ID: Here you will just need to enter your Google+ page ID.

Instagram Username: Here you will just need to enter your Instagram account name.

LinkedIn Page ID: Here you will just need to enter your LinkedIn page ID.

Pinterest Username: Here you will just need to enter your Pinterest account name.