CakePHP Like Plugin provide a feature similar to Facebook "Like".
Ratings Plugin for CakePHP.
Favorites Plugin for CakePHP
Social and SEO plugin
Croogo plugin for showing graphical social bookmark links
Adds Facebook Open Graph and Twitter Cards support to CakePHP 3.x
cakephp helper plugin that creates links to popular bookmarking web-applications
Add comments and star ratings to your existing CakePHP applications with ease.
Adds fields to a model for saving social links, eg. Blog, Facebook, Twitter, etc.
Gravatar helper for CakePHP 2.0 and above.
A Croogo CMS plugin to show social sharing buttons with advanced privacy. Uses socialshareprivacy script by Heise (http://www.heise.de/extras/socialshareprivacy/)
A minimalistic SocialMedia Plugin for CakePHP
CakePHP Social Media Plugin
Gigya (Facebook/Twitter/SocialNetworking) Plugin for CakePHP