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Is there a way to retrieve a list of (others') posts which were reposted by the authenticated user?
Also: Is there a way to list posts made by the authenticated user which were reposted by others? (Though, I appreciate this way might be more like the Interactions stream).
No. You can individually see which users have reposted a single post but there is no notion of "give me all the posts a user has made which have been reposted"
Is there a way to retrieve a list of (others') posts which were reposted by the authenticated user?
Also: Is there a way to list posts made by the authenticated user which were reposted by others? (Though, I appreciate this way might be more like the Interactions stream).