Wu Jun, the head of Soso search and a former Google executive, left shortly after the company’s restructuring in the past May. It seems it even didn’t benefit from Google’s retreat from Mainland China — both Baidu and Sogou gained market share then. The problem with Soso has been that, as both outside experts and people from Soso said, it isn’t used as a separate search service but an in-site tool. But within two month, Qihoo search grabbed approaching 10% of market share from Baidu. Qihoo CEO expects to gain a 15-20% market share on desktop, “based on our traffic and browser coverage”(source in Chinese) .