It’s a whole genre of application. It’s called a feed reader. In fact, what you are looking at right now is a feed reader, but only posts made here, like you made, are visible to the general public. Pretty sure that if you follow any other RSS feed with your account on SangerFeed, it will post the post here (visible to you, that is—not to others). I could be wrong about this though. That is certainly how it works for me, as Rob site owner.