Questions and answers service
問答服務
- Google Answers closed
- Microsoft Live QnA
- Taiwan BBS
- WikiAnswers[1]
- Wikianswers - a Wikia wiki
- Yahoo! Answers
- UK Yahoo! Answers UK - Ask Questions & Get Answers On Any Topic
- US Yahoo! Answers
- TW Yahoo!奇摩知識+ (Indexing issue: The robots.txt limited other search engine crawling the service.)
- 天涯问答
- 搜搜问问
- 百度知道
- federated search of above web sites ex: learning object