Android 4.2 - Contact photos sync

Hey guys - I am very lucky (subjective) to have gotten my hands on a Nexus 4 this afternoon. WOOP.

However, I am brand new to Android, and I was wondering if anyone could tell me how I get my Facebook friends' photos to show up as my contact photos???

There is a facebook sync button but it doesn't appear to be working - have read several people having a similar issue on previous phones/versions.

Can anyone help?! Many thanks!