http://blog.stackoverflow.com/2008/12/why-cant-i-accept-my-own-answer/https://blog.stackoverflow.com/2008/12/why-cant-i-accept-my-own-answer/
http://blog.stackoverflow.com/2009/01/accept-your-own-answers/https://blog.stackoverflow.com/2009/01/accept-your-own-answers/
read in chronological order
