Originally intended as a place for analyzing lyrics, Rap Genius has become a forum for annotating any culturally significant text. Sometimes, the site’s founders even step in and leave their two cents, and yesterday cofounder Mahbod Moghadam did just that on alleged UCSB shooter Elliot Rodger’s 140-page manifesto, “My Twisted World.” If you read the text over the weekend, like so many people did, you may have been sickened, terrified, or distressed by Rodger’s words. Moghadam didn’t seem to be, and he left a series of annotations on the missive, via his Rap Genius user page.