IMHO: "Hover Hands" = Polite Photo Op Manners
When taking a photo with someone, no matter how well you may or may not know them, you're expected to stand close and usually throw an arm over their shoulder or behind their back. This is something that quite frankly many people find uncomfortable and awkward, and yet has become pretty much the default photo pose for groups of two or more. When taking photos with people, I personally feel weird gripping onto them with my hands for those ten seconds between when you strike the pose and when the photo is taken. When someone else does it, it bothers me even more. I don't even particularly like having to grasp onto family members for xmas card photos, so I sure as heck don't like doing it with people who are not blood relatives. Now, that's not to say everyone out there has a phobia about physical contact. The point though is that you can never know how another person feels about it, and I'd hope that anyone taking a photo with me would do their best to minimize their invasion of my personal bubble when engaging in such a pose. Without a website like this to draw attention to it, no one notices what peoples hands are doing in a photo and therefore there is no reason that people should feel the need to grapple or over handle the person next to them. It's not necessary and you risk putting someone else ill at ease