That's useful as a tool for a manual search, but you can't trust it by itself, since sites can tag any image as CC. In fact, you can find very well known -and definitively not CC licensed- photos on that search, like World Press Photo winners or Leibovitz's.
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You should pre-populate the images with stock photos found on google images.
That's copyright infringement. Just because they're available on Google Images doesn't mean you can use them on your own site.
You can ping Google images for images filtered by licenses.
That's useful as a tool for a manual search, but you can't trust it by itself, since sites can tag any image as CC. In fact, you can find very well known -and definitively not CC licensed- photos on that search, like World Press Photo winners or Leibovitz's.
"found on <some service>" then.
You can just link to the image on the original site. No distribution means no copyright infringement. Rude yes, illegal no.
Illegal no
I wouldn't be so sure: http://news.cnet.com/2100-1030_3-6145744.html