Yammer now integrates with Viva Topics to make community-sourced knowledge easily accessible across an organization.
The Topic Picker experience
When posting a conversation or a question in Yammer, you can associate a Viva Topic by selecting the Add Topic
The Topic Card experience on hover
You can see the Topic Card for a given topic when you hover over the topic pill associated with a conversation.
Hover over the topic pill to get the experience as below:
The Topic Feed experience
Note: The link shows up only for users who have a paid Viva Topics license.
To view a topic feed, select a topic pill to navigate to the feed for the topic as shown below: