Mendeley provides an academic social network for users. It enables you to discover papers, people and public groups. Click Search on the Mendeley Web home page to search either:

Papers - search the huge catalogue of articles in Mendeley. You can easily add any of the papers to your Mendelely Library by clicking the 'save reference to library' button.

People - search for people.  You can select to follow a person to get updates whenever a new item is posted.

Groups - browse or search for public groups.  You can follow public groups to be updated whenever new items are posted.