<human>: Can you succinctly summarize the text in 1-3 sentences?

Hi all,

Thanks in advance for reading.  I was not really sure where to pose this question - any advice welcome. (Only became a redditer recently, so apologies for poor formatting or breaking any rules of reddiquette.)

I am a 25-year old male, and graduated from undergrad a few years ago.  I was on a NSFW subreddit recently and found a pic of someone I know from college.  She's not really a friend per se, and is a few years younger, but we run in the same circles and have been friendly whenever we've chatted (she's a super sweet girl).  

The photo is not nude, but is of her in a bikini, and I think was taken from her facebook.  Based off of the user's history, I do not believe it was her posting her own picture.  

Is this something I should bring up to her?  Is there a way to do it without embarrassing her?  What if she is aware of the post, and is more embarrassed by the fact that someone she knows saw it than by the fact that it was put up in the first place?  What's the best way to have this conversation? And if the picture was taken from her facebook, it's already public - to what extent would this bother her? Should I try and get it taken down before I even tell her?

Bonus topic - obviously, my first priority is to save her any embarrassment.  However, if there's a way to broach the subject that doesn't start with "So I was looking at some dirty pictures on the internet and...", that would be preferable. I know, I know, it's not unusual in this day and age, but still.

Oh, side note - we're both of Indian descent, and it was a subreddit dedicated to Indian girls.  I don't think that actually makes any difference to anything. She's definitely attractive. Again, probably irrelevant.
<bot>: Found a picture of an acquaintance on a NSFW subreddit. The picture was taken from her Facebook.  Should I inform her?  If so, how?