MultiSite Engage user & Anti spam by RetinaPost makes users Read More related posts and protect WordPress from spam. Displays extracts from blog articles or simple useful messages and engage users to READ MORE while securing your web forms. Replaces annoying Captchas and non secure client site verification with something better in combating comment spam.
This plugin is MultiSite compatible: – It enables the super admin to control how the plugins is used across the entire network. – The usual admins can change some options too.
It has been tested and found compatible with: Akismet, Antispam Bee, Quick Cache, W3 Total Cache, WP Super Cache.
Plugin homepage: http://www.retinapost.com/wordpress/