OSINT Some Helpful Links

Advanced OSINT Attacks: http://itdrafts.blogspot.co.uk/2014/09/advanced-osint-attacks.html

http://www.onstrat.com/osint/
http://www.theosintgroup.com/open_source_intelligence.html
http://www.subliminalhacking.net/2012/12/27/osint-tools-recommendations-list/
Check usernames: http://namechk.com/
http://checkusernames.com/?username=gotinside
Yahoo discussions: http://groups.yahoo.com/group/osint/
Google Plus https://plus.google.com/communities/114790458534065015277
Pentest Standards: http://www.pentest-standard.org/index.php/Intelligence_Gathering