As you may have guessed, this is a compilation, or a list if you're that kind of person, of people's birthdays. Give me your birthday and you shall be added to my list.
Also, Manly what do you plan on doing once you run out of digits in the OP?xD (if you can run out of digits that is, I imagine you can, but then again...).
There is no character limit for posts. That list could contain the birthday of every user ever if that information was available, and if Manly wanted spend years writing down the birthdays of millions of users.