You can favorite Tiles, Lists, and Items that you like so you can easily find them later. Click the Favorite button Favorite when viewing a Tile, List, or Item to save it to your Favorites. Lists and Items with a privacy setting of 'Unlisted' are not able to be added to your favorites.
You can follow interesting users by clicking the Follow User button when viewing that user's profile. You can also search for and discover new users and follow them directly from the Users page. You can get to the Users page by clicking on the 'Users' link in the footer.
To view your favorites, click the from the right side of the header and select 'Favorites'. Here you can see your favorite Tiles, Lists, and Items, as well as the Users you follow.