My girlfriend used to change her birthday every month or two, to see who would send her birthday wishes repeatedly -- she believed that people shouldn't rely on

My girlfriend used to change her birthday every month or two, to see who would send her birthday wishes repeatedly -- she believed that people shouldn't rely on Facebook for such information. I finally convinced her to stop after I got sick of seeing the same 50 people write on her wall every month. Luckily I was in on this and put her birthday into Google Calendar...