8 Similar Sites to Wikipedia

Wikipedia is top resource for reference and a hub of knowledge mostly people use it for reference. I also use it for same. After Wikipedia many similar sites come in this field to defeat it but no one could succeeded even Google could not. But there are some other useful sites that are similar to Wikipedia and have their own importance. I visit sometime those sites also.

(1) About
About is an online guide on any social topic, there are 750 experts to help you. You also can become a guide.

(2) Wikihow
Wikihow is a wiki having more than 76,000 on How To. There you can learn and contribute.

(3) Wikia
You can create your own Wiki here. Here you can find many articles on who is, how to, and theory etc. These are a questions and answers section.

(4) Answers
Here you can ask questions, reply answers.

(5) Reference
Refference.com includes dictionary.com and thesaurus.com, so here you can find references and search meanings in dictionary and thesaurus.

(6) Howstuffworks
Here you can find how stuff works, mostly here you will find technology related stuffs.

(7) eHow
here you will find how to do just everything. You will find how to of the day, top how and how to guides.

(8) Knoll
Knoll is a unit of knowledge, is not like Wikipedia but it is a product of Google and it was advertised as Wikipedia alternative.