[usp_display_posts] : default displays all submitted posts by all authors
[usp_display_posts userid="1"] : displays all submitted posts by registered user with ID = 1
[usp_display_posts userid="Pat Smith"] : displays all submitted posts by author name "Pat Smith"
[usp_display_posts userid="all"] : displays all submitted posts by all users/authors
[usp_display_posts userid="all" numposts="5"] : limit to 5 posts from all users
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