Query posts from different categories in multisite

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In my planed multisite installation, I want the members to be able to post in one of two different categories.
Members in A can post in 1. Members from B can post in 2. All members can comment everything.

Then, I plan to create a custom page template to the blogs index, and I hope to query all posts from members in 1 and 2, and display title and a minor excerpt (along with avatar image) in separate columns (widgets).

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Is this possible? (I am not planning to use Buddypress).

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  1. For restricting the categories, maybe the plugin Restrict Categories can help. But it doesn’t have Multisite capabilities.
    Take a look at the filter list_terms_exclusions that it uses in the cat_filter function.

    But Role Scoper states that it has “Extensive WP-mu support”. May be worth a try.

    For the query part, take a look at this Q&A, find a random blogid across my multisite network that has at least one post published.
    Basically, you need the functions switch_to_blog and restore_current_blog.