... Looking for ...

referer =

people search services:

Bigfoot, Internet Address Finder, Four11, Switchboard, InfoSpace, WhoWhere?.

... their pgp public key

Writing to one of the following, using the subject lines HELP, ADD or GET will get you most pgp public keys:

pgp-public-keys@keys.nl.pgp.net, pgp-public-keys@foo.oucs.ox.ac.uk, pgp-public-keys@informatik.uni-hamburg.de, pgp-public-keys@idea.sec.dsi.unimi.it

... words

Important (meta) search engines around the world