A recent report showed that although the majority of these criminals are based in India and China, Botswana is also listed among countries with a sizable number. Other countries implicated are Egypt, Syria and South Korea.
It is a complex scheme that takes advantage of a loophole within the system of online advertising on the World Wide Web. The usual process is that an advertiser puts an advert with a search engine such as Yahoo or Google. The search-engine carries the advert on its site. However the search engines also recycle the adverts to millions of other websites from known ones such as time.com to smaller obscure ones.