Friends only - comment to be added. If it was I who added you, click this first for a possible explanation. If that doesn't explain it, or you can't see it, or if you read it and it still makes no sense, drop me a message and I'll be glad to explain.
Two levels of friends: regular and "Friends." Random people who add me randomly will start out on the regular friendslist, those I add back will most likely go on Friends. (Other option is "acquaintences," but there's no one on there now, so...)