Scholarly social networks are becoming more popular among scholars as a way to share their work, find collaborators, interact with peers, and obtain new metrics to demonstrate their research impact. In addition to the traditional number of citations, these metrics include a number of reads, downloads, or mentions in blogs or tweets.
Remember about copyright when uploading your articles to such sites. Generally, you may upload a pre-print version of your paper, but not the final version published in a journal. Review your agreement with the publisher for details.
The most widely-known scholarly social networks: