Its sight not site.
Site is where you drop off lumber to build a house, aka "The job site."
Sight is as in SEEING something, aka "Your a sight for sore eyes!" "Your a sight to behold!"
English 101 is over now! lol!
ORIGINAL: Rhody Hunter
i've heard of this also but don't usethem . It must be a site if you use a lot of them like Christmas ornamentson a tree