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Kanye appeared at the Facebook Headquarters in San Fransisco earlier today and performed a few new things acapella. If you look at the tracklist that leaked, a few things might line up. Presumably 'Lost In The World', 'Chain Heavy' and 'Sweat On My Face'
Nice suit!
UPDATE: Footage of another verse and 'Mama's Boyfriend' after the jump, props to UHTN.