The Shareaholic plugin for WordPress provides an easy, free, way to add social share buttons to your web site. This video explains how to use it. http://GeckoGullyWebSites.com
It also offers analytics and related posts, but these are not covered in this video.
This is where you can get the Shareaholic plugin: https://wordpress.org/plugins/shareaholic/
This is my post (mentioned in the video) on how to install a plugin onto WordPress: http://geckogullywebsites.com/add-plugin-wordpress-site/ Want to know how to download this video from YouTube? http://HowToDownloadFromYoutube.com/