These aren't algorithms. This is a search engine - what you put into it is up to you. It can be anywhere from the silliness seen in the link, to "friends who live in London" before you take a trip.
This is just handing people another tool - the uses, and misuses, of said tool are entirely on the users.
> " If you think about who the average Facebook employee is, you'd realize that you probably wouldn't want them to be in charge of designing a system meant to model the intricacies of human interaction."
A snarky and mean-spirited stereotyping of all nerds as socially inept! How clever.