Boosting is really important on the Fediverse because it makes whatever you boost federate to the entire servers of all your followers. A boosted post appears on your followers' timelines, but also becomes searchable to everyone on all the servers of your followers.
Instead of an algorithm, the Fediverse relies on human beings sharing stuff they find interesting. This process creates a wonderful chain of discovery.
To boost something on here, click the 馃攣 or 馃殌 button below the post.