The values stored in these user preferences were valid for the old
flickr auth mechanism and are not usable any more. The new oauth1 based
version needs to store both the token (in the flickr_access_token
preference) and the token secret (flickr_access_token_secret). The new
version does not need to store the user's nsid.
The cryptic names of these legacy settings are a result of how dealing
with user preferences was originally implemented.
Eloy Lafuente (stronk7)