In particular, using tooltips would provide a similar effect to what Facebook uses for people tagged in photographs. There are lots of options to style and recolour tooltips in HotSpotsPro. It could be setup so that tooltips appear when you mouseover faces. The tooltip could contain the name of the person. I think it should work quite well.
There is a free demo version of HotSpotsPro, so you can fully test the stack to see if it comes close to what you want.