1. Did you take that picture?
If so, I suggest you look at the address bar at the top of your screen. This will tell you the site. Or take a screen shot if you're wanting to show us the site. Use gimp or photoshop to blur the faces, or just go in paint, select the area of each face and delete it. Or cover it with a black box. your call.
If not, I suggest you ask for a screen shot of the site from whoever gave you the picture. Assuming this person doesn't know how to take a screen shot, him/her to look for the prt scr button on the keyboard. They should press that button. Then they need go to start, all programs, accessories, paint. Do whatever they usually do to copy something (ctrl + V, edit menu copy, right click then click copy, whatever). Save the picture, which should now be the screen shot which was taken.
2. Is your question to verify if we can recognize it from a picture? Because if you're wanting to post that picture but don't want it to out either that the girl works there or even what site it is, you're in the clear!