Some employees may remain in downtown Palo Alto — neighborhood part of firm's 'DNA' by Arden Pennell / Palo Alto Weekly Uploaded: Mon, Aug 18, 2008, 1:08 pm 13 Updated: Mon, Aug 18, 2008, 4:16 pm Time to read: about 3 minutes The Internet firm Facebook, headquartered in downtown Palo Alto with more than 600 employees at five offices, will move a substantial portion of its operations to a site at S