Both iPhone and BlackBerry have some pretty basic Facebook applications available, but the king of the social networking hill wants to really dig into the mobile demographic after announcing 13% of their users access services by phone. New features they’re looking to pump out include profile picture caller ID, as well as address book synchronization. Facebook’s Phonebook service hasn’t been around for too long, but it only makes good sense to integrate with mobile. Personally, I’m using a roundabout Facebook-to-Outlook-to-BlackBerry syncing process to get my friends’ latest profile pictures and birthday reminders on my Bold, but it’s very clunky, still doesn’t get phone numbers and has to be updated manually. Nokia is in talks with Facebook on how to get involved, and as we know, the Palm Pre will be working very closely with Facebook.