To reduce duplicate content displayed on your Wall, you can activate the option "Avoid duplicates" in Settings>Sources:
With “Avoid duplicates” activated, we actually check for two things:
On Twitter, we filter out retweets so they don't get shown multiple times
On Twitter, we filter out posts that were created via Instagram's "share to Twitter"-feature
Important: There's currently no way to filter content that has been duplicated between other social media platforms than the ones mentioned – for example: a post that has been published on Facebook and Twitter using the same image and text, will still be displayed twice on your Wall!
In case you have further questions, don't hesitate to contact the support team via the chat or firstname.lastname@example.org!