11. A method, comprising: at an electronic device having a display and a touch-sensitive surface: concurrently displaying a plurality of snippets of text including a first snippet of text and a second snippet of text, wherein: the first snippet of text includes first displayed snippet text corresponding to a first portion of text from a document associated with the first snippet of text; and the second snippet of text includes second displayed snippet text corresponding to a second portion of text from a document associated with the second snippet of text; detecting a first gesture associated with the first snippet of text, wherein detecting the first gesture includes detecting a first contact and a second contact on the touch-sensitive surface and detecting movement of the first contact relative to the second contact on the touch-sensitive surface; and in response to detecting the movement of the first contact relative to the second contact: modifying the first snippet of text to include an additional portion of text from the document associated with the first snippet of text that was not included in the first displayed snippet text, wherein the additional portion of text from the document associated with the first snippet of text includes: additional text that occurs prior to the first displayed snippet text in the document associated with the first snippet of text; and additional text that occurs after the first displayed snippet text in the document associated with the first snippet of text; and maintaining display of the second snippet of text without adding any additional text from the document associated with the second snippet of text to the second snippet of text.
14. The method of claim 11 , wherein: the additional text that occurs prior to the first displayed snippet text is displayed in accordance with movement of the first contact on the touch sensitive surface; and the additional text that occurs after the first displayed snippet text is displayed in accordance with movement of the second contact on the touch-sensitive surface.