I avoid telling people about my birthday, I don't like them doing things for me because some day in calendar
Once my student group leader found out about it, she told my group about it and they organized me a big cake. I told them that they would better gave me meat.
This time around even my best friend forgot about my birthday. My mom didn't know what to gift me. My boyfriend didn't keep track of it, but gifted me a picture of our favorite anime girl once he found out.
People nowadays rely on Facebook or other social site to tell them about birthdays. For me such practice is completely unacceptable. If the person does matter to you, you better keep it's birthday date in your head. It's not necessary to gift them a present, just at least give them your attention. When people get reminded about your birthday in the last moment by Facebook and try to gift you a cake, it really cheapens and underminds whatever value they contribute to your date and really shows that they don't care about you all that much.