Go to BrandMentions' Analytics to the section Top Sites to see the list with the websites that mentioned your monitored keywords the most. 

Click on the mentions icon from the right and a pop-up similar to the one below will appear. This way, you'll be able to export this set of mentions straight from this section.

Once you click on View more you will see the whole list of sites that mentioned your monitored keywords, the number of mentions and their performance.

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