Chatter for VF Page

 Display Chatter Feeds on a Visual force Page:-

  Vf page:- 

   <apex:page controller="test12">

   <apex:form id="main">

    <apex:pageBlock >

        <apex:pageBlockSection >

            <apex:inputTextarea value="{!comment}" style="width:500px;height:50px;"/>

            <apex:commandButton action="{!post}" value="Post" reRender="main,reff"/>

        </apex:pageBlockSection>

        <apex:pageBlockTable value="{!feditm}" var="f"> 

            <apex:column value="{!f.CreatedBy.Name}"/> &nbsp;&nbsp;&nbsp;&nbsp;

            <apex:column value="{!f.Body}" /> <br/>

        </apex:pageBlockTable>

    </apex:pageBlock>

   </apex:form> 

</apex:page>

class:-

public class test12 {

   

    public String comment { get; set; }

    public List<FeedItem> feditm{get;set;}

  

    public test12(){

        feed(); 

    }

   

    public void post() {

        

        FeedItem post = new FeedItem();

        post.ParentId = Userinfo.getUserId(); //eg. Opportunity id, custom object id..

        post.Body = comment;

        post.CreatedById = Userinfo.getUserId();

        insert post;

        feed();

    }

    public void feed(){

        feditm = [select Body,InsertedById,CreatedBy.Name from FeedItem ORDER BY CreatedDate desc];

        comment='';

    }

}

In above example displaying the chatter feeds on Visual force page for User.