Improve the search engine; add 'duo' parameter.
There are some advertisers who specifically list another partner for 'duo' opportunities in their profile, but they do not advertise as duos. Therefore the only way to know who is or is not in a duo is to go look at the individual profiles. Can I suggest you include one extra field/tickbox in your search parameters for 'duo' please? That way a simple search of advertisers by area by favourites (now with "duo" as a favourite) will yield the results much quicker than having to trawl through endless profiles.