• Getting the Google IDs of liking users is interesting, but I didn't know about "Reader's view of a feed", also interesting. [via kottke]
  • "To help you understand how Web Caches will treat a Web page, the Cacheability Engine will look at a URL (and optionally any images or objects associated with it), giving both specific cache-related data about it, and a general commentary on how cacheable the object is."