Pulled this out into its own topic so we can discuss it here. I suppose it was set to anonymous as the default for a reason? If not, I agree we should change this default to ALL.
The anonymous default makes sense for public sites (because it lets people who are not members of the community quickly share a topic elsewhere) but it makes no sense for private sites (because there are no anonymous users!). On the other hand, the option to share via social media does not make sense on private sites because the links are not accessible without being logged in.