This article on the phenomenon of parents sticking their new baby's pics online to show distant relatives raises some interesting points, but I couldn't work out the problem.
At one point the author seems to be suggesting the problem comes from future embarrasment from having your baby pictures online to be discovered by potential boy/girlfriends (I agree with this one - take them off the net, it's the parent's jobs to embarrass kids with these pics!). But in the next paragraph they are suggesting the remote possibility of paedophiles getting hold of the images. Much more worrying, granted, but far less likely.
I've put a few galleries of pics online now & again - of special outings or holidays or somesuch - and never really seen a problem, but then I've not exactly been rolling in visitors - and only took them down for maintenance and to redesign the site.
I'm working on an "active desktop" type site, where the front page works as a 1024x768 desktop wallpaper, with links to news, weather and other things, like those galleries. It's very much a work in progress, so don't expect any revelations any time soon.