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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]
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"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."