To the best of my knowledge, the best among all is answeree. It won the best among all in my rating because it is easy and has alotvif encouraging features with soundsound, familier and direct life changing topics. It doesn't give restrictions yto type of question, what natters is the question and idea of the answerer.
The site has a beautiful auto save feature that allow the user to continue his/she already started article. The directly familiar ttopics makes it easy to write at least minimum of 120 words with even beyond the minimum required 600 character. Without threat to each other's participation.
I think the main thing that is helping the site is not encouraging referral and putting little point for raising post.
Once you raise a topic on the site, you earn 1 point for that and once you write a reply to a post, you will equally earn 1point. . but if it is a reply, of 120 words and 600 character above, you will earn 10point for that. At the endend, the minimum cash out is $30.