Another cool thing to do with strings would be to treat every session as a new episode- first thing in every session is for the players to decide who has gain 1 string on their character since last time- and why.
I´m watchin buffy nbow- first session, and suddenly there are a whole gang of bullies (who gets turned into Hyenas with Xander at the zoo) who haven´t been around before- and they have relationships to the characters from the first minute.
So, it´s a chance for the players to decide what the game will be about today.
1.) That's a neat idea.
2.) Hyenas is the best episode in the first season.