This search service supports the account name search and the keyword search.
About the account name search, it can search by the account name (displayed name on WeChat) and the account code. And if you click the displayed account name, then it will be displayed the posting history.
Last time, I explained that WeChat has not prepared the method of spreading information in the platform to the official accounts. But this search service will be useful for the official account on WeChat, because it will be able to be found by users more easily than now. It will be useful for users too, because it can help users to find the information easily what users want.
Sogou have provided the search engine since 2004 as a subsidiary of Sohu. But Tencent invested 448 million USD last September, and Tencent now has 36.5% stock of Sogou. They started to grope for the collaboration from that time, and this search service is surely the one of their result.
As I mentioned above, Sogou is the third largest search engine provider in China. And according to the recent report by CNZZ, their market share is 12.44% as of May 2014.
The difference with the two largest companies(Baidu and 360) is still big, but I think that this service can help to reduce that difference. Because WeChat will not provide such search result to that two largest companies.
Let's keep watching the future situation of this.
Source => WeChat search service by Sogou
