Do academic social networks share academics’ interests?

Social networking services for academics are great for networking and getting feedback but at what cost to your privacy? How are these services monetizing you and your work? “Do academic social networks share academics’ interests?” in the Times Higher Education  is truly eyeopening! And don’t forget that Academia.edu is not an .edu and should be a .com.
There are many other ways to share your scholarship including depositing your work in Academic Works and subject pre-print repositories.