Question2Answer : Question2Answer site helps your online community to share knowledge.
Question2Answer

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Overview
Question2Answer site helps your online community to share knowledge. People with questions quickly get the answers they need. The community dynamic is enriched by commenting, voting, notifications, user points and rankings.

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Features

  • Fast integrated search engine.
  • Categories (up to 4 levels deep) and/or tagging.
  • Voting, comments and follow-on questions.
  • Points-based reputation management.
  • Email notifications and RSS.
  • Built-in user account management.