From the January 11, 2010, edition of The New Yorker, "Top of the Pops," an article by Louis Menand on Andy Warhol:
". . . he painted over 'Thirteen Most Wanted Men' with silver paint--a visible erasure that was widely read as a statement about censorship."
I love that oxymoron.
Reminds me of Thomas DeQuincey calling the human brain a palimpsest, which, as you can see from the Online Etymology Dictionary, is a word akin to palin, which is YIKES akin to moron, not oxymoron.
In the long run, I'd say that all blogging is subject to the palimpsest of visible erasures in the Ephemerasphere of cyberspace.