We've had issues with cubs in a domestic violence abuse situation where posting photos of the cub online put them at risk because they were hiding from dad. So we didn't post any pics of that cub, with our without his full name attached. That is common decency.
There is also such a thing as needing to have a model release to use photos of other people for certain purposes like advertising. So you can't just take photos of kids and use them how you wish.
A scout (and scouter) is friendly and courteous, getting parental permissions would fall under that. Using photos just because you can is poor form, and considered poor netiquette to post photos of other people's kids online..
Unfortunately any other adult parent in the group can take pictures of scout activities and they don't have to adhere to any BSA requirements. They can instantly turn any and all photographs and names into an on-line viral event. Unless one bans all photographic technology from all one's scouting activities, the inevitable can happen.