Silk, Amazon’s new “cloud accelerated” browser, has drawn the ire of security experts and politicians alike since it funnels most of the tablet’s traffic through Amazon-controlled servers. Silk operates by utilizing Amazon’s AWS cloud servers to download of web page elements in parallel, then funnel this info back into the tablet. This works significantly faster than HTTP protocols but does have to run through Amazon’s servers. The SPDY protocol only logs three pieces of information: URL of the resource being requested, the request Timestamp, and session token.”]
Source: https://gizmodo.com/amazon-sets-the-record-straight-on-silks-security-5851179