1. A method, comprising: receiving a notification that copy data comprising a reference has been placed on a computer-implemented clipboard, the copy data conforming to a first data format; identifying supplemental data not on the clipboard using the reference within the copy data, the supplemental data external to a source from which the copy data originated, the reference comprising a Uniform Resource Locator (URL) referencing an Really Simple Syndication (RSS) feed, the supplemental data comprising the RSS feed; adding the supplemental data to the clipboard; identifying second supplemental data not on the clipboard using a second reference within the supplemental data, the second supplemental data external to the source from which the copy data originated, the second supplemental data comprising content of the RSS feed; and adding the second supplemental data to the clipboard.