Q+ hangouts is a series of online seminars on quantum information and quantum foundations that take place in Google+ hangouts
Google+
Dan Browne founded “quant-ph” circle aimed to discussing latest preprint news etc. Write him to join.
Wiki
http://www.quantiki.org/ with http://www.quantiki.org/video_abstracts
http://qwiki.stanford.edu/
Preprint archives & Questions and answers
http://arxiv.org/
http://theoreticalphysics.stackexchange.com/
Blogs
http://www.scirate.com/ (currently down)
http://www.quantumblah.org/
http://quantalk.org/
http://dabacon.org/pontiff/
https://quantum.opticsolomouc.org/
Group lists & directories
http://www.quantumoptics.net/ (Quantum Optics and Atom Optics links)
Non-specific or general scientific professional networks:
http://www.linkedin.com/
http://www.academia.edu/
http://www.researchgate.net/
Please, feel free to add another sites and blogs you know!
