Give us a Yammer "Join" button that we can add to SharePoint site. We use SharePoint sites with Yammer integration (widget + embed code) for some intranet pages, particularly for community-oriented pages. They would like to use the Yammer group to control access beyond the homepage (which is open to all), and are asking for a "Join" button they can place on the homepage that adds the user's name to the Yammer group and therefore gives them access to further resources deeper in.