extractTopic
Description
Extract tweet content
Paramters
1. name: searchStr type: string description: string need to search;
2. name: pid type: int description: current pid;
3. name: unicodePage type: string description: unicode html already download;
4. name: firstPage type: boolean description: whether this page is first page of this company
Return
True, description: finished this page;
False, description: failed this page