If you've ever used HTC Sense on Android phones before you will know of the Facebook sync feature which worked flawlessly. SmartSync does the same as HTC Sense did but for iPhones. This great app lets you keep your contacts up-to-date by adding their latest profile pictures, and adding information such as birthdays, statuses, address, email addresses, website, company, job title all to their profile. Their profile picture even comes up with they call you. You can choose to have it sync only with your current contacts in your iPhone or you can import contacts you don't have from Facebook. A great feature is the reminder for a contacts birthday, however I would only recommend this if you have a really tight knit group of Facebook friends. If you have over 300 friends it will undoubtedly get annoying with the amount of birthday notifications.