Yesterday was Facebook, today it's the staff of Twitter hosting Kanye West, who gets a microphone this time. Once again he raps without music, though there's an upright piano in the room. There's not one piano improviser in the Twitter brain trust? [videoembed size="full_width" alignment="center"][/videoembed] Update: Here's Kanye doing "Heartless," "Power," etc.: His untitled album is out 9/14 via Roc-A-Fella ...