Defrag a SSD on a Win 7 machine?

on the following thread: http://community.norton.com/t5/Norton-360/SSD-and-Disk-Optimization/m-p/682449

 

one person said not to worry about Norton's tune-up defragging a SSD because Norton uses the Windows defrag which automatically won't defrag a SSD drive

 

another person said to just turn it off

 

is there a consensus on this?