CakePHP Like Plugin provide a feature similar to Facebook "Like".
Ratings Plugin for CakePHP
Favorites Plugin for CakePHP
Croogo plugin for showing graphical social bookmark links
CakePHP 3 plugin for Facebook OpenGraph and Twitter Cards
cakephp helper plugin that creates links to popular bookmarking web-applications
Add comments and star ratings to your existing CakePHP applications with ease.
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