Social Networking for Researchers.

An article in SciDev.Net deals with social networking sites specifically for researchers.

With the growth of online science networks, geography and economics no longer dictate how research is undertaken or published, finds Smriti Mallapaty. 

Just as matchmaking sites connect romance-seekers based on their relationship compatibility, new academic social networks are connecting scientists based on their professional research interests.

The article mentions:

• ResearchGate, 
• Mendeley and 
• Academia.edu

"(T)he most popular countries for ResearchGate and Mendeley are Brazil, China, India and Indonesia, with between 19,000 to 250,000 users in each country."

The article also lists Chinese sites:

• ScienceNet.cn
• DXY.cn

"MedicineAfrica designed an online tutorial space and social network modeled on Facebook but specifically aimed at healthcare professionals."

The Synaptic Leap — in an open-source process of scientific development initiated in an effort to develop cheaper drugs for the parasitic infection schistosomiasis.

Here is a related article on Open Source Drug Discovery (OSDD).

More:

• What Is A Scientific Social Network? 6 Thriving and Inspiring Examples
• UNIPhy
• Social Networks for Scientists