Lightning Apps "forceChatter:feed" Sample Code

LightningChatterFeed.app

<aura:application >
    <link rel="stylesheet" href="/resource/BootstrapSF1/dist/css/bootstrap.css" />
    <link rel="stylesheet" href="/resource/BootstrapSF1/dist/css/docs.min.css" />
    <script type="text/javascript" src="/resource/jQuery/dist/jquery.min.js" />
    <script type="text/javascript" src="/resource/BootstrapSF1/dist/js/bootstrap.min.js" />
    <script type="text/javascript" src="/resource/BootstrapSF1/js/docs.js" />
    <!-- Header Component -->
    <c:LightningHeaderComponent header="Lightning Components" detail="- Sample Application -"  />
    <!-- forceChatter:feed -->
    <forceChatter:feed type="News" />
</aura:application>

can we display feeds specific to Group? I mean can we set group id somewhere in forceChatter:feed?

Hi, Thank you for message. I thought I could do with Subject Id. But it seems not to be supported.

OK! I did It! you set type="Record" subjectId="groupId".

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
  <forceChatter:feed type="Record" subjectId="0F928000000AZ7oCAG"/>
</aura:component>

Hi,
I am using the following line of code in my lightning component:
<forceChatter:feed type="Record" subjectId="0057F000000YuK0QAK"/>

But, my footer i.e., comment, share is not working.
Can anyone tell me what is the problem?

Thanks.