Facebook's Graph Search presents the problem of discoverability. One can have a good balance of privacy and openness if information is available, but not easily discoverable. You might not mind if people specifically interested in you look at your Likes, but you may not want to have a market researcher pull the list and add it to an ad targeting profile. You might be okay if a new person you met at a conference looks you up on Facebook, but you may not want a creepy guy searching through Facebook's loose networks to find someone to stalk. All of a sudden, what people once thought was shared only to their Facebook audience—whether friends, friends of friends, or member of the public with a specific reason to look you up—is now readily available via Graph Search. This feature has rolled everyone, by default, into a dating service ("Single females in San Francisco who like Radiohead") and a marketing database ("People under 25 who like Coca-Cola").
Facebook Graph and the Problem of Discoverability