Using Flickr to publicize our programs

We post some great photos to our programming blog, but no one but us sees them. What would be involved in setting up accounts like Flickr? Would we need to get permission to use pics of minors (or majors) if we don't tag their names? At my branch, we do sometimes add photos to our Happenings display to show people that a good time was had by all at BIB or SRC. Flickr would take it out of the branch into the home pcs.

BTW, I checked Flickr for photos with the tag Annapolis and found some wonderful pics by a photographer named Toshio.