Flickr: friends only setting!

Hi. I like SocialThing, but I have a lot of flickr contacts (400+), and I'd like to be able to choose "show only friends" versus "show all contacts." I know some people have a lot more than I do. I would turn off flickr, but then I would lose visibility to my closest friends' posts. I know I can uncheck them individually, but this would make a lot more sense and be much more user friendly. Thanks!