By David Walter
Ivy League grads are purging Facebook friends for "Defrienduary" — and we're obsessed
You've heard of Drynuary. No-shave November. Yom Kippur. Lent. Now, consider a new detox holiday: Defrienduary.
The premise is simple: one Facebook defriending per day, every day, throughout the short month of February. Think of it as Marie…