A young woman from New York going by the internet handle "creepytings" and real name Casey Nocket recently took an extended trip to Western national parks including Yosemite, Joshua Tree ,Crater Lake, Zion, Canyonlands and possibly other parks, tagged the rock with her "art", and posted photos of herself doing it on the internet. She did it in acrylic so it will be hard to remove. The story broke here
http://www.modernhiker.com/2014/10/21/instagram-artist-defaces-national-parks/
and there's a thread about it on supertopo. The alleged artist/vandal has responded to internet criticism by claiming it was somehow a feminist act and that her critics are "mansplaining" to her.
If you feel the way I do about narcissistic people vandalizing beautiful rock in national parks, consider signing a petition on whitehouse.gov asking that the perpetrator be prosecuted and not just be given a slap on the wrist.
https://petitions.whitehouse.gov/petition/press-charges-casey-nocket-finesmax-community-servicejail-timeetc-httpgooglhy4yqj-defacing-np-nm/1y8xJBGm