As a member, you can now group your favourite listings together. These could be people who write interesting blog posts or people that organise events you are interested in, listings that have a really nice looking shop window etc.
Simply view the listing you like, then find and click on the Add to favourites button, on the bottom right of that page.
You can get to your favourites page via the drop down menu next to your name, on the top right of every page.
PS. They will need to have added their main image on their listing for it to be displayed in your favourites as a thumbnail.