Plugin Name: Social Like
Availability: 
Purpose: Use the social like plugin to place "like" buttons for Facebook, Google+ and Twitter on each event in your calendar.
Configuration:
The following settings are available in the calendar's plugin settings:
Social Like Plugin: You can enable or disable this plugin for each calendar
Facebook Button: Use this to enable or disable the Facebook button
Facebook Verb to Display: Choose "Like" or "Recommend"
Facebook Share: Enable this option to add a share button
Google Plus Button: Use this to enable or disable the Google Plus button
Twitter Button: Use this to enable or disable the Twitter button
For a Facebook only like button with more customization options, consider using the Facebook Like plugin .
This plugin is available starting with release 4.0.12 of Zap Calendar.