Relationship Symmetry

This was a new topic for me, but a simple one to consider.  It is also an interesting way to categorize various networks out there.

http://bokardo.com/archives/relationship-symmetry-in-social-networks-why-facebook-will-go-fully-asymmetric/

The idea is that a relationship in a social network can basically be one-way or two-way.  Today in Facebook relationships are two-way or symmetrical.  This means that for you to be my friend, I have to be your friend.  There are personal reasons to desire this that also lay the tone of a symmetrical relationship network.  An asymmetrical relationship network is essentially one way.  You can be my friend or follow me without me having to be your friend or follow you.  Twitter is exactly like that and lends itself to a tone that is more public. 

This seems like a cool topic that would be interesting to analyze in actual relationships outside of the computer.