On x.com your bookmarks are locked to your own account. Nobody else can see a single Tweet you save, and there is no way to open that list up to anyone. Birdfeeder changes that on a bookmark-by-bookmark basis, so you decide exactly which saved Tweets stay private and which ones you want to show off.
Every bookmark in Birdfeeder carries its own visibility toggle. Flip a Tweet to public and it joins your Birdfeeder profile; the rest stay hidden. The first time you make one public we spin up a public Birdfeeder profile for you automatically, so your x.com followers get a clean page of the finds you actually want to share instead of your entire private stash.
If you are curious what a public profile looks like, take a look at my personal profile.
Let us know what you think!