Important Sites List to get backlink from

https://groups.google.com/forum/#!overview

https://groups.yahoo.com/neo

http://www.ask.com/answers/

yahoo answers

http://angular.marketing/free-tools/delete-duplicates/

academica.edu - pdf - instert site link

about.me - keyword / anchor text link in profile

ted.com  -  keyword / anchor text link in profile

http://topsy.com/ - For Searching links and social content

http://www.dropmylink.com/ - To Get links that give backlinks  for specefic keyword.