We're plagued with something new. Not just spambots, but also weirdos who change their birthday to make the illusion that every day is their birthday.
The easiest way to recognize them is to check the "Birthdays" window for 2-3 days. If one person stays in there, they qualify.
Checking their profile is also a way to make them out. They usually have strange names, are ALWAYS 22, and have some strange stuff in their "occupations" and "interests".
If you see someone like this and are a moderator, feel free to ban them. They're doing nothing for the community and they clog up the "Birthdays" window.