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Maybe I was wrong when I mentioned anonymous.
I'll try to explain what I mean.
If you open someone's facebook page, you see all the information, comments, friends, enemies, posts, .....
If you open a steemit site, you see the blog that I put on the "wall" and if you go deeper dig, you will see the status of my account or something like that.
All data are not available at the first sight.
Maybe I'm wrong, because personally I do not have a FB, and I do not know all of its privacy options. And maybe because of some unpleasant experiences my closest friends have had I just have prejudices. If I'm wrong, please correct me.