Twitter released a new update for its iOS app that makes it easier for users to keep track of conversations between friends. To keep tabs on who’s saying what to whom and when, Twitter has added a blue line that connects conversations and displays replies to tweets in chronological order.
Conversations can now be expanded by tapping the blue line to see more replies from people you don’t follow. Twitter also added new notification settings and bug fixes.
Here’s a video on how the blue line works:
https://www.youtube.com/watch?v=BnRmayAuB4M
Source: Twitter