Susie was particularly interested in whether a friend or family member has seen pictures that you have posted online, either here or at some similar site.
Interesting question as besides the accidental reveals, such as leaving a screen shot showing, or opening up pictures on your phone of you dressed, I would think that it would take some work to find the pictures and that would mean visiting sites such as this. In that case it would be saying something about the individual who found the pictures.
One issue I have is that if you search pictures on your computer it will also show pictures from those files you keep separate from the picture album files. i have had one incident when searching through pics with a woman friend looking over my shoulder, a few of these showed up. I was scrolling through at a fast pace and the pictures were small but she must have noticed.