Twitter is again starting to roll out new features on Spaces. It seems to be the main focus of the platform recently. To boost Spaces discovery, the platform tested topic tags on the Spaces end card for iOS. It also opened up Spaces to everyone. Today, Twitter tests the topic tag bar via iOS.

Social media consultant, Matt Navarra, shares a tweet about the update. Bubble tab now appears above the main Twitter feeds of iOS users. These features topic tags based on a user’s tweet activities. Such an update is an enhancement of topics a user can follow on Twitter.
Twitter tests the topic tag bar via iOS on 04 January 2022.
Implications for Marketers:
Twitter topic tags can help boost Twitter engagement. For marketers, being featured in relevant topic tags can also boost brand awareness and reach. So, it will be best to experiment with harnessing such a feature on Twitter marketing.
Reference: https://twitter.com/MattNavarra/status/1478408732820262918