User generated content from online communities is highly effective for generating inbound traffic in this era of Google Hummingbird.
Public: Content is viewable to anyone who can see the blog page.
Private: Content is only viewable by you.
Personal: Only the blog owner can publish blog entries.
Ghost Writer: The blog owner and any ghost writers can publish entries; blog owner is the displayed author.
All Bloggers: Any user who can blog can publish blog entries to this blog and the person publishing the entry is credited as the author.
Posts are available for others to use on their websites or to access through a newsfeed reader program