I found this awesome free utility on the web , TinEye
it can found your images on internet using their web crawler.
the uses are endless:
you can know where your photo is and if someone stole it for example...
I tried it with some Dreamstime pictures and it works!!
You can use the utility directly on their home page after signing up or download the plugin for Firefox or Internet Explorer.
If someone wanted to know where their pictures are used, now they can, Great!!!