"Suggested Favorites" in Picasa Web Albums, suggest friends and contacts who you may want to add as Favorites, allowing you to easily keep track of what they're sharing with the world in their public albums. While you can find photos from people you care about, this means that they can find you too, which isn't always a good thing. For this reason, Picasa also introduced ability to block certain users. Blocking a user immediately removes them as a Fan, preventing them from receiving future email notifications about your public albums. It also cuts off their ability to comment on your photos and deletes all their old comments across your gallery.