We had planned to feature wiki users birthdays on the Main Page, as you can see here. The problem is that we got 183 responses, and it would require way too much work to organize them into the charts, not to mention that it would take up way too much space on the main page.
We have decided not to do them, and we apologize to the people who submitted their birthdays. You can still edit your profile on your user page to include your birthday. Thanks for your understanding.