Yup. And there are a lot of people who blindly click 'follow' on any featured post, or blindly reply to featured content. Have a look at some of the responses to promoted or featured articles, a lot of them are used to seeing only their friends postings, and assume the content is addressed to them personally. This leads to a lot of confused replies.

I think this shops the problem with combining a public forum with people publishing content to the world, and a social network of connected individuals talking to each other. Facebook is the latter, Twitter is the former, and Google+ seems to want to be both and is not succeeding. It may end up successful as one or the other, time will tell, it's too early to write it off, though.