Kanye West debuted songs from his new album at Facebook's headquarters earlier this week.

The rapper, who was wearing a suit, performed acapella versions of 'Lost In The World/Chain Gang' and 'Mama's Boyfriend'.

West was watched by an audience of Facebook employees, who greeted the new songs enthusiastically.

In a message on his blog, West thanked the audience, describing their energy as “so electric, so genuine”.

“The energy was so inspiring I had to keep going!” he added.

West's new album, thought to be entitled 'Good Ass Job', is due to be released in September.

(by Jason Gregory)