I'm not sure why this is harder than choosing an email address to send an email to. Some things I'd share with FAMILY, some things I'd share with EVERYBODY, some things I'd share with MY QUILTING GROUP.
Seems like the easiest thing in the world.
Also seems weird to say that even selecting a group to share to is a massive hurdle, but the fact that facebook buries the same functionality behind 5-6 clicks for each post is convenient. Seems more like it was too easy, and had to be made harder.