So back in 2011, the library (NLI) joined Flickr Commons, a part of the online photo-sharing community that encourages public photo collections to post their archives. The library then asked users to help track down the stories behind the faces and places in its collection.
For information about joining, leaving and suspending mail (eg during a holiday) see the list website at https://www.jiscmail.ac.uk/cgi-bin/webadmin?A0=archives-nra