I am a member of several internet dating slash social networking sites.
On this one particular site, the images are uploaded to the top of the stack. Users can have an infinite array of pictures, but the ones uploaded most recently are displayed first. Each profile displays nine pictures at a time, and the user has the option (though the the interface for actually doing so is horrible), to create photo albums and arrange the photos.
A while back, I became friends (only via profile friending - similar to the Facebook) with a larger, but still cute, girl. Her sizable (quantitatively) collection of photos showed off a lot of her, so there wasn't any deception there.
More recently, she added some new pictures. The site alerts friends to new uploads by other friends, so I immediately checked them out when I got the alert. She was noticeably thinner in all of the pictures that she uploaded, so I sent her a text asking her if she had lost weight.
She didn't answer the question initially, and instead asked me why. I told her why, and then after a delay she answered that she hadn't lost weight, and that the photos were old.
fan-fucking-tastic. I just unintentionally hurt someone's feelings, which is one of my least favorite things to do.
Regardless of how you feel about the gravitationally challenged, the offense here should be fairly obvious. Because of the way that this particular site handles photos, uploading old pictures without labeling them as such is deceptive. Granted, it was probably unintentional in this case, but it's still deceptive nonetheless.