18. The method of claim 17 , wherein the gesture metric is a measure of distance between the first contact and the second contact prior to detecting an end of the gesture.
17. The method of claim 11 , including, after detecting the movement of the first contact relative to the second contact: detecting an end of the first gesture; and in response to detecting the end of the first gesture: when a gesture metric based on the first gesture is above a predefined threshold, displaying a portion of the document associated with the first snippet of text that includes the first portion of text; and when the gesture metric based on the first gesture is below the predefined threshold, ceasing to display the additional portion of text.