4

In Google+, I'm not sure who can see a comment I make on a post. Is it open to the world, or just to people that can see the original post? (I realize that the set of people who can see a post can expand over time.)

3

Only the people that can see the original post can see the comment.

See Who sees the content you post in the stream:

When you +1 or comment on a post, whoever can view the original post will be able to see your +1 and comment as well.

protected by Community Feb 26 '13 at 3:21

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