Website for imagen uploads

Hi,

I have in mind to do Website to upload images and linking these images, for example, such as imgur.com
I do not know which is the best script that I choose and someone regarding script selection can help me ?

Another thing I do not know it can be done and It's about image that is uploaded on my website for imagenes that is only visible for linking on websites that I determine.
To help understand me I'll give an example. Someone upload one image on my website for imagenes. This image is visible to linking only on website Non-Existent Domain and www.websitetwo.com and on all other websites can not be to linking. That means when someone put a link of the image between code tags [ img ] [ /img ] image is not visible.

Thanks