One feature I do like in Facebook that Google+ did not have, until yesterday, was the ability to be reminded when your friends and family have birthdays that day.

Irene Chung from Google announced on Google+ that Google now has that feature.

Assuming your circles on Google+ share their birthday with you, you will see a notification of your friends (circles) birthday for the day and you can wish them a birthday greeting. Same with you, if you share your birthday with your circles, they can wish you a happy birthday greeting.

Irene from Google explained:

Forum discussion at Google+.