Twitter this afternoon announced the launch of a new feature that's designed to link two tweets together in a more logical way.
When composing a tweet, there's a new option to view previous tweets, which can be selected and linked via a "Continue Thread" option.
To get to the Continue Thread interface, just pull downwards on the compose window on an iPhone or iPad and then tap on the Continue Thread option. Tap on the three dots and then choose an older tweet from the list to link the new tweet to the older tweet.
The Continue Thread option makes it much simpler to associate a new tweet with an existing tweet for threads around a specific topic. Twitter is rolling out the new feature as of today, though it could take some time to propagate to all users.