As for the feature on LiveJournal that "forwards" posts to either Facebook or Twitter, not much has changed with me. I had already had MY posts to LiveJournal posted to Facebook automatically for quite some time, can't remember exactly how, but think it originally involved RSS... but the LiveJournal "Friends Only" posts never went to Facebook. On the new thing, I checked to make sure friends on LiveJournal comments did not go to Facebook also (very easy setting), yet my posts would go there, thus garnering different comments.
Didn't do the thing where posts go to Twitter, since I usually put a link to my "public" posts on LJ there anyway manually.
Frankly, I don't get the controversy. It's just a couple of check boxes to get things the way one would want them.