Topic List is a collection of Twitter categories. Last 06 November 2019, Twitter allowed users to follow a topic list. Once you followed a topic list, the feeds on the list are visible to you and your Twitter friends. The update allows a user to share a topic list via DMs, other key discussions, or tweets. It’s easy as a click on the share icon on a topic page. Once a topic list is shared, it will show in a generic thumbnail. Twitter may be updating that in the future.
Twitter enables sharing topic list as of 22 October 2020.
Implications for Marketers:
Sharing a topic list is a new way to boost the discovery of a Twitter post. For marketers, this can be an option to uplift campaigns. You can upload product posts and tag them on relevant topics. Then, group them on a topic list and sharing it with groups. This can effectively build a brand community.