From "1984" by George Orwell:

Memory Hole:
A memory hole is any mechanism for the deliberate alteration or disappearance of inconvenient or embarrassing documents, photographs, transcripts or other records, such as from a website or other archive, particularly as part of an attempt to give the impression that something never happened.
The concept was first popularized by George Orwell's 1949 dystopian novel Nineteen Eighty-Four, where the Party's Ministry of Truth systematically re-created all potentially embarrassing historical documents, in effect, re-writing all of history to match the often-changing state propaganda. These changes were complete and undetectable.

Sounds familiar doesn't it - this is happening right before eyes here and now. Prove me wrong.