Brings to mind the series of tubes that powered the information system in 1984's Oceania, and how antiquated the mindset that envisioned that system, with its memory holes that could eradicate past information forever.

That said, even if today's distributed system prevents a gatekeeper from having sole veto on information, today's filter bubbles and chaos of viral disinformation campaigns can be such a barrier against truth that perhaps they can be considered, for all practical purposes, a type of modern day memory hole.