To each their own! There may also be demographic factors at work: I'm 29 and was among the first of my friends in college to use a digital camera. Certainly among my peer cohort sending / receiving NSFW pics is a common practice, but I obviously can't speak for everyone.
I suspect there are a lot of people like me out there, who would be leery of wholesale uploading to Flickr, for fear of missing a couple shots that shouldn't be public. I do use Flickr, but only for selected shots: https://www.flickr.com/photos/91262622@N02/ , some of which are just website storage. Others are experiments; for example, I bought an Olympus OM-D recently and have spent a lot of time getting accustomed to the camera.
You should put your e-mail address (obfuscated) in your profile; I was about to send you a message about this that's too specific to be of interest to most HN readers.
