it could also be that they're using google goggles to research info about the painting.
If I had a smartphone I might play with this more for the novelty effect of "can it tell me what painting this is? how about this one?"
It probably has more to do with people being confused about what they are supposed to do in a museum...ooh maybe I will take pictures to show how cultured I am.
One thing I like about being a member of the art institute (beyond not having to pay $18 for a 30 minute lunchtime visit since they stopped pay-as-you-can donations) is that I don't feel any pressure to see everything in a visit to "get my money's worth". I can cruise through galleries, stopping when something catches my eye, and not worry about missing what was around the back corner since I can see it later.
Always nice to blow by one of the crowd pleaser paintings like I don't even give a fuck.