It depends on who you are trying to reach really. I think the scientific community and nonprofit tech community have a decent presence here. But in terms of shear number of actual active users -- Facebook definitely wins. Even I have to admit that I occasionally forget about Google+ (and I find my stream more difficult to manage than Facebook). I get most of my news/info from FB and Twitter still.
Check out my #innovatehealth interview re: #publichealth innovation +@fastfwdhealth with +David Haddad and +Evagelia Emily Tavoulareas Seriously love the folks at Ashoka Changemakers! Please spread the word!
Passionate about innovative projects, individuals and organizations who move the needle within the public health world. These new social tools allow us to connect, share information and collaborate on initiatives that will make the world a better place.