[BortimusPrime]

Trying to manipulate people into doing something is just marketing. What I see as the potential danger is having everyone's facebook page marking whether or not they're organ donors. This is one of the nastier tendencies of ideological groups: once they're in the majority they start getting people to wear little insignias to demonstrate support for the cause, and pretty soon the great microbrained masses start gleefully attacking anyone they see failing to wear the insignia. Look at how after 9/11 every single politician started wearing those flag lapel pins.