There are three types of groups in Mendeley. They are listed below.
Follow other Researchers. Identify collaboration partners with Mendeley. Search the people directory and follow interesting people.
Readership Statistics. Look on the bottom left on each paper page to get know a little more about who is using the paper.
View Your Library Any Time. Make changes to your Mendeley Library on the web by clicking on the "Library" tab. Remember to sync in Mendeley Desktop to make sure your changes are active everywhere you access Mendeley.