i dont see the point in this feature, though I wouldnt say no to it.

If i didnt keep it contact with my XI friends then its most likely because i didnt like them or just wanst close friends or for another reason similar, so why would i care much about finding those people? As for people who i'd want to find, they'd be friends i liked and more often than not friends i like i still talk to so no need for feature.