Its a shame that Dee/default_friend deleted her twitter, as the internet-history-as-oral question she's raising is a real one, though sort of not in the way that she's approaching it. I'll explain.
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I tend to think the problem will go the other way: without the ability to view a running feed in real time, public blog posts and chat messages will be archived [albeit spottily] but difficult to review due to their volume. Look at how many tweets Trump had.
To be fair, most stuff is hosted privately, and some hosts would sooner delete their archives than hand a copy to an archivist. I don't think that's Big Tech's way, though. I figure/hope everything you put into Twitter, FB, Google etc lives forever for better or worse.