There are two preferences for viewing content on your homepage on Tsū: the Chronological feed and the Trending Feed.
The Chronological feed will allow you to view new content as it gets posted. This feed will organize posts by time, with newer posts being at the top and posts getting older as you scroll.
The Trending feed allows you to see whats currently hot and popular on Tsū. The posts toward the top will be the posts that have gotten the most engagement.
You can easily toggle back and forth between the two by clicking "Activity Feed Preference" at the top of your feed.