Nowadays a Yammer Community gets a corresponding Microsoft 365 Group (Office 365 Group, Unified Group). In your work as an SPO Admin, you might need to differentiate “ordinary” Modern Team Sites from those ones that were created for a Yammer Community. They both have GROUP#0 as Template. On the actual SPO Site object, there is nothing that you can use to differentiate those. Neither you can use the Office 365 Group information.

I have installed SharePoint SP1 on my development machine. Yammer and OneDrive links have appeared in the Central Administration: If you go ahead and click “Configure Yammer”, you can activate it: Because: Yammer is Microsoft’s recommended tool for social collaboration. When you activate Yammer, you’ll get this dialog, and the Yammer link in the SuiteBar: What happens when you click on Yammer, is that you are redirected to Yammer.com and you are prompted a login page.