Can expatriate professors be found via expat websites?
Why would you bother with such a thing? Why wouldn't you simply Google the name of someone who interests you, but is currently abroad to find new contact information?
Or, why wouldn't you do a Google search like "US professors working abroad" or "UK professors working abroad" if you wanted to get a general feel for the issues?
In fact, you could Google something like "can expatriat professors be found via expatriate websites" and turn up useful pages like
http://www.transitionsabroad.com/listings/living/resources/online_expatriate_community_discussions_forums_blogs.shtml on how to find expatriates doing specific things via online communities. Instructions on how to do useful searches are included on that page.