So I'm looking at a popular website for amateur sex pics and, much to my chagrin, I came across a picture that I am 99.999% positive is my younger sister giving a guy a blow job.

Do I tell her what I found? If it were me, part of me would want to know so I could confront the jerk who posted the photo; however, part of me wouldn't want to know b/c I'd freak out and worry about it, yet not really be able to do anything about it since it was already on the net.
What do you think? Thanks.