Add Chatter functionality to your Visualforce pages in minutes using the following components:

• <chatter:feed>: Displays the Chatter feed for a record.
• <chatter:feedWithFollowers>: An integrated UI component that displays the Chatter feed for a record, its list of followers, and optionally, a header bar that allows users to show or hide the Chatter feed and subscribe to it.
• <chatter:follow>: Renders a button for a user to follow or unfollow a Chatter record.
• <chatter:followers>: Displays the list of Chatter followers for a record.

Here's an example of the <chatter:feedWithFollowers> component:

Note that Chatter components don't render for Visualforce pages using Force.com sites.