1. A method of sending a graphical expression during a text messaging session comprising: receiving user input on a first computing device during the text messaging session, the user input specifying one of a plurality of graphical expression modes, wherein each of the plurality of graphical expression modes has a predefined graphical expression, an associated sensor, and a sensor data definition for the predefined graphical expression; determining, by confirming that data from one or more sensor of the first computing device received during the text messaging session is from the associated sensor and matches the sensor data definition of the specified one of the plurality of graphical expression modes, that the predefined graphical expression of the specified one of the plurality of graphical expression modes is to be performed; and transmitting an expression command from the first computing device to a second computing device through a network during the text messaging session in a communication between the first computing device and the second computing device governed by a text messaging protocol, the expression command identifying the predefined graphical expression to be performed on the second computing device.