For instance, all my friends and real relationships know my gender. I am not sure why it is important Facebook know my gender. So, put the opposite gender in for the data. I think this is a rather interesting problem for social networks. Do they use historical data to determine your gender or do they go from the current value? In any case, when I use female, I get female ads which are not very distracting since I am not really at all interested in that content aside from curiosity that I am being marketed feminine hygiene products. This lowers the value on ads if they are not targeted correctly because some computer algorithm is ultimately completely stupid aside from its instructions given it by a hu-mon. Maybe an interesting idea here is that humans know, where as social networks need to divine. So, screw up the looking glass. Change your age, eye color, religion, city you live in, etc. Even though I am sure there are smart individuals that will come up with great algorithms to divine information, there job is a lot more difficult now and approximate at best.

Considering the picture and face recognition software: a software app should be created that can inject peoples faces into fake pictures that mis-identify the individuals in the picture and therefore creates bad relationships.

A con to this is if you need the information for creating relationships that do not exist yet. For instance, I do not really want to indicate I am female on a dating social network. Another is if you want people to be able to search for you based on criteria. But you still can search for people with interests in basketball. Your identity matters little if you want to discuss a hobby.