LibraryTechNZ mentions an interesting engagement of a European library with its community, something that bookstores could also do:
The library at the Hague in the Netherlands has introduced a simple form of tagging in real life. They now have two returns drop-boxes. One is for all items, and the other is for amazing books. Staff take the ‘amazing’ books and put them in the ‘amazing books’ display for visitors to browse. But they also tag them ‘amazing’ in the Library’s collection database.