I’m not trying to be hostile, just that the term “manifesto” implies something that people would want to be publicised (such as our own countries political parties manifestos for the up and coming election!) Yes the young American lad should have included the byline but maybe there wasn’t one where he found it! he himself appears to have grown older and given up partying so I can’t even ask him where it came from!

it is quoted here

http://www.ecstasy.org/experiences/trip98.html

and here as well

Ravers Manifesto by ~ravers on deviantART

also minus any attribution to the author – and and I would guess a fair few other places.. good luck finding the rest!