What does it mean when you send a picture on Facebook and it says it was shared?

[Mckenzie Landry]

I sent some pictures to someone I know on Facebook then I clicked on the little I think on the top right corner so I could look at his profile and on the bottom it said shared pictures and it said the amount so could any one tell me what that means? Does it mean he sent other people it or that's the last pic I sent him? Please answer ASAP thank you

[abraXus]

it could mean that, but it's more likely that one of his friends shared it because they saw it on his profile

you dont really understand how facebook works, do you