As a lawyer who deals with pages, reams, volumes, boxes, rooms of written information on a daily basis I'm often amazed (and pleased) by the depth of concepts that can be expressed through 140 characters.
Example from today, @SusannahFox's tweet:
@SusannahFox What if, instead of a chief #privacy officer, ONC changed the conversation and appointed a chief data rights officer?Susannah gets my "tweet of the day" award.