I am thinking about buying a nexus 7 and am impressed with the ability to use an external blutooth keyboard with it making it almost like a small laptop. I am however interested to learn if there is any way to link the "7" up to anther monitor to increase screen size making it more "computer" friendly.  My wife wants a computer/tablet so she can facebook, ebay, and do general computing things without having to be all that "techie". She has poor eyesight though and the larger screen would help her see a little better.
Any suggestions?