BuddyPress is a feature rich plugin for WordPress which greatly extends the functionality of the usual WordPress site. BuddyPress is absolutely free and greatly customizable and helps you build a community website.
Your site members will be able to invite friends, create groups and check each others activity feeds, send public and private messages and many more.
For full feature list of the BuddyPress we recommend their official website at:
If you would like to start your BuddyPress Social Network in a few clicks, check the BuddyPress Hosting package which includes Free BuddyPress installation, upgrades and free premium support.