The newsfeed is an activity feed of your social media accounts. It allows you to follow and act on content posted by users.
From the newsfeed, you can access user comments, replies, Retweets etc. You can directly reply to Tweets or Facebook comments in the name of the account. You can also like or favourite comments or Tweets.
To do so, from the newsfeed, click on the response icon. A text box is then open, allowing you to type and validate your answer.