Others like Yahoo's Answers generate a lot of traffic but have drawn mixed reviews on the quality of answers.

WSJ: Quora and Others Are Racing to Fill Gaps Left by Google

Facebook users can ask for restaurants their friends visited recently and see reviews, but considering the fact that each user has only a limited number of friends, this query is likely to generate very few answers.

FORBES: Move up http://i.forbesimg.com t Move down

Answers can also generate their own comments, or get flagged as stupid or irrelevant.

FORBES: Obsessed With Quora

On behalf of our student leaders at Hamble Community Sports College, we hope you enjoy the answers our questions generate for you to read.

BBC: Pupils produce questions for young sport personalities

RasiFranks may know how to drive traffic and generate attention, but it appears to lack answers to these basic questions.

FORBES: Digg Manipulator RasiFranks Responds