Bricks is tokens given as rewards for individuals' contributions to r/Fortnite either via posts or comments etc. They can be freely transferred, tipped, and spent in r/Fortnite.
Bricks can be traded freely and used for any number of purposes within the community. At this time, they can be used to display reputation within the subreddit, unlock exclusive features like badges and GIFs in comments with a Special Membership, and add weight to votes in polls.