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Can web pages found with the Wayback Machine qualify as prior art?

I'm trying to claim prior art on the "Twitter" patent. But if that prior art only ever existed as a web page, and only now exists as a Wayback Machine snapshot, does it qualify as legitimate prior art?...
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CALL FOR PRIOR ART: (Twitter) “Device independent message distribution platform” (8401009)

This is a recently issued patent from Twitter "Device independent message distribution platform" This recently issued patent describes the basic mechanics and functionality of Twitter. BASIC ...