Questions and answers service

問答服務

• Google Answers closed
• Microsoft Live QnA
• Taiwan BBS
  • 批踢踢實業坊 - ask看板
  • gaaan.com - ask | 問板
• 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(alternative)