Error: Access Token is not valid or has expired. Feed will not update.
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There's an issue with the Instagram Access Token that you are using. Please obtain a new Access Token on the plugin's Settings page.
If you continue to have an issue with your Access Token then please see this FAQ for more information.

Unable to display Facebook posts.
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Error: (#10) To use 'Page Public Content Access', your use of this endpoint must be reviewed and approved by Facebook. To submit this 'Page Public Content Access' feature for review please read our documentation on reviewable features: https://developers.facebook.com/docs/apps/review.
Type: OAuthException
Code: 10
Please refer to our Error Message Reference.