You can get reminders for your Facebook friend's birthdays and create and share personalized greetings or emoticons on Facebook. There are greetings and emoticons for any occasion.
Notifications are sent once a day to remind you of friend's birthdays on that day. If no friends are having a birthday today, then you will not receive a notification. You can turn the notifications off, change the time or alert from the Settings.
Birthday Reminders (On/Off) - Turn the daily reminders on or off.
Alert Time - Change the time for the reminder
Alert Sound - Change the notification sound
Friends' Birthdays - Choose to receive birthday reminders from all of your Facebook friends or only your Top Friends from Facebook.
"Top Friends" will give you birthday reminders for the Facebook friends you interact with the most.