A mechanism for the temporary storage (caching) of web documents, such as HTML pages and images, to reduce bandwidth usage, server load, and perceived lag.

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Facebook for Android app no longer displays og:image of website served via home computer's IP

I've followed the advice given in this post. I have updated the Facebook cache, and shared a website on Facebook on my Facebook timeline (shared only with me for testing purposes) via a web browser. ...
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Is it possible to see several versions of a webpage using GoogleCache?

When using GoogleCache, is there a way to see several previous versions of a site - or is it only possible to see the latest one? (Yes I know - and eagerly use - the WayBackMachine (archive.org), but ...