Flipboard uses a proxy service to fetch, validate, and prepare certain elements of websites for presentation through the Flipboard Application.
As an administrator, you may notice the "Flipboard" or "FlipboardProxy" user agents in your logs recording a cluster of relatively tightly spaced requests. These requests generally come in response to a user request that our service scan a social media feed (Twitter, for example) and construct a processed feed of items to deliver in real time. Our requests currently all originate from the Amazon EC2 cluster.
For a longer discussion of Flipboard's proxy service and how it treats robots.txt entry, see this getsatisfaction discussion.
Please contact us if you have any concerns about our service policies.