#7 Quora.com

Quora is a question-and-answer website created, edited and organized by its community of users. It aggregates questions and answers to topics. Users can collaborate by editing questions and suggesting edits to other users' answers.  Signing up for a free account is mandatory to access the website and its recommended to thoroughly search the site before posting a question. More often than not, the query you have would have already been asked by someone else. You can also search for answers to queries by category.

#8 Wiki Reference Desk

The Wikipedia reference desk works like a library reference desk. You can leave a question at the reference desk and Wikipedia volunteers work to help you find the information you need. There are many topics where you can get help either by search or by asking a question. Some of these includes Computers and IT, Science, Humanities, Mathematics  and others.

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