The Audience Subscription web part allows site visitors to add and remove themselves to a centrally managed set of public Microsoft 365 groups. A common use is to combine this with the SharePoint audience targeting capability.
Administrators can select which groups are available
MANAGING GROUPS BY USER
Site visitors can add and remove themselves to selected groups
Fully responsive for mobile devices and works great in Microsoft Viva Connections
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The Noticeboard web part allows site visitors to browse and post to a noticeboard. This is deliberately a one-way communication channel (unlike Yammer or Teams). A common use is an internal ‘for sale board’.