Questions and answers service
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問答服務
- Microsoft Live QnA
- Yahoo! Answers
- UK Yahoo! Answers UK - Ask Questions & Get Answers On Any Topic
- US Yahoo! Answers
- TW Yahoo!奇摩知識+ (robots.txt: indexing issue)
- Google Answers closed
- 天涯问答
- 搜搜问问
- 百度知道
- federated search of above web sites