The text discusses using feature flags with Beamer to send targeted in-app announcements. Feature flagging allows for different experiences for various user groups, and the same flag can be used to target in-app messages. In-product announcements are made using feature flags extensively, along with in-app notifications for news and product changes. The integration of Beamer's Advanced Segments with LaunchDarkly's feature flags enables creating Custom Segments based on the target users of a feature flag. This allows for targeted in-app announcements to specific user groups by selecting the right Segment filter when creating a post.