The site shouldn't be advertising a persons exact DOB (date of birth) but instead allow an option to add their age or at least not allow their exact DOB to be visible to the general public. Most companies use DOB for verification and by the site advertising a subscribers DOB leaves them more susceptible to identity theft.
there should be an option to turn it off... looking into it.
though one should be much more worried about a place like myspace that shows real name and birthdays vs usernames which have very little risk.
Will