List of Researcher Services (a paper in Journal of Library Administration 2016)

Author/Researcher Identification

—these services provide some necessary infrastructure that may be used in the other two categories, such as unique identifiers and name disambiguation

Academic and Professional Networking

—most succinctly described as “social networking for academics,” these services focus on connecting users based on research interest, affiliation, geography, or other variables.

Reference and Citation Management

—while these tools and services include some of the functionality and features of other categories, they are distinct given their primary focus on management of citations that a researcher compiles for use within a publication or for sharing with other researchers.

Reference 

http://dx.doi.org/10.1080/01930826.2016.1146534
http://www.tandfonline.com/doi/full/10.1080/01930826.2016.1146534