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The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
AnswersLOG - AnswersLog is a question-answer platform that provides unique features to help you to give answers to your questions in better ways and make your content more popular.
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Fluther - Question and answer service based on user profiles and a user score.