<human>: One of the most convenient applications Facebook has is the Birthday Notification tool. Once a person puts in their birth date Facebook will automatically notify all users on the person's friend list that it is their birthday. 

At first I used this device to wish people Happy Birthday, now it is a great tool for highlighting individuals on my Fiend list that a. I don't associate with, don't like or care for or b. I don't even remember how they got there. So lately every time I log on, if it's someone's birthday and I they fall into those categories I unfriend the person. And no I don't say happy birthday either.

Can you summarize the given text in a few sentences?
<bot>: Facebook birthday notifications are a convenient way to remind you of people that are on your friend list that shouldn't be there & I unfriend people on their birthday.