Partially incorrect. While Google's calendar does have a "Birthdays" calendar, it only includes birthdays from your Google+ contacts, and there's absolutely no

Partially incorrect. While Google's calendar does have a "Birthdays" calendar, it only includes birthdays from your Google+ contacts, and there's absolutely no way of adding a custom birthday into it. So, you would have to have a Google+ account and add every single person you want to include birthdays in as your Google+ contact. Outlook's calendar has an option of connecting to Facebook and collecting birthday info from your friend list if you wish to. I know that Russian Mail.ru calendar also has this option (+ optional email alerts for birthdays). Pretty handy if you keep your Facebook friend list nice and short. You don't have to add all of them manually.