From the Activity Feed, it's possible to tap to view individual tweets to Reply, Retweet, or Favorite, and tapping on a name also leads to a profile where a Direct Message can be sent to a user or someone can be followed. A force press on the Apple Watch within Tweetbot will bring up the option to send a tweet, and composing a message is done via voice dictation.
Today's update is the second major update to Tweetbot 4, which Tapbots released a month ago. Tweetbot 4, a newly universal app for the iPhone and the iPad, introduced a redesigned look, new Statistics and Activity Views, and support for features like split-screen multitasking on the iPad. A later update also brought support for 3D Touch on the iPhone 6s and 6s Plus.
Tweetbot 4 can be downloaded from the App Store for $4.99. [Direct Link]