I followed this link and added the
<PublishingWebControls:RichHtmlField id="PageContent" FieldName="PublishingPageContent" MinimumEditHeight="400px" DisableInputFieldLabel="true" runat="server"/>
to the enterprise wiki page. It works fine on Premises. But in Office 365 it does not appear. It seems like that control has been disabled my Microsoft to promote Yammer.
Can some one show me an example how I can either create an SocialComments WebPart or wrap the Socialcomments WebPart in another WebPart and add it to the layout page.