I've seen this feature on other social games: being able to add notes about a player (for your eyes only, not theirs) to help you remember things about them.
I've found this feature especially helpful for when I make new friends (birthdays, things you have in common, where you met etc) or when someone has been particularly generous/kind toward me.
Anyone else thinks this would be useful?
**Also, you can keep track of who you've blocked and why...coz you never know**